摘要:

228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm. by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms.per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm.by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C.Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm. by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting

ISSN:0003-2654    

DOI:10.1039/AN9194400307

出版商:RSC    

年代:1919

数据来源: RSC

摘要:

228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm. by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms.per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm.by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C.Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm. by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate.The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm.by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate.The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm.by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms.per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm.by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting

ISSN:0003-2654    

DOI:10.1039/AN9194400309

出版商:RSC    

年代:1919

数据来源: RSC

摘要:

228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm. by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms.per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm.by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C.Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm. by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate.The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm.by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting

ISSN:0003-2654    

DOI:10.1039/AN9194400314

出版商:RSC    

年代:1919

数据来源: RSC

摘要:

228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm. by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms.per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm.by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting

ISSN:0003-2654    

DOI:10.1039/AN9194400317

出版商:RSC    

年代:1919

数据来源: RSC

摘要:

$OOD AND DRUGS ANALYBIS 319 ABSTRACTS OF PAPERS PUBLISHED IN OTHER JOURNALS. FOOD AND DRUGS ANALYSIS. Presence of Aconitic Acid in Sugar-Cane Jnfee, and New Reaction fop the Deteotion of the Acid. C. S. Taylor. (J. Cbm. Soc., 1919,115,886-889-)- The presence of aconitic acid in sugar-cane juice was inferred by Behr (Ber., 1877, 10,351) but not conclueively proved. In the author'^ experiments awnitic add was ieolated from both healthy and diseased sugar cane, though it could not be obtdned in crystalline condition from the latter.It is present in the form of a salt and not in the free state in the oane juice. In addition to the usual qualitative tests it W&6 found that aconitic acid when treated with acetic anhydride gives a pink coloration, which changes rapidly to deep red and then to magenta.On heating the mixture a bluish-green liquid is obtained, which becomes brown and almost opaque. The magenta, liquid apparently consisted of two coloured subetances, EL red compound soluble in water, and a blue compound readily soluble in ether, but both were exoeedingly unstable and were rapidly decomposed by water, acids or alkdia Appaxently the colour reaction ia due to condensation of the carboxyl groups of the acid, with possibly elimination of water or addition of acetic anhydride.Applied as a test the reaction is capable of detecting 0.01 mgrm. of aconitic acid. None of the other acids in sugar-cane juice gives the reaction, but citric acid may be detected by melting it in a, test-tube, when traces of sconitic acid are produced, whioh then retact with the acletic anhydride.C. A. M. Purified Ether and the Variations in Commercial Samples. A. J. Jones. (Pham. J., 1919, 103, 71-73.)-The BP. prescribes tests €or the permissible limits of aldehyde, vinyl alcohol and methyl compounds in purified ether, and, as a rule, commercial samples amwer to these requirements. It is contended, however, that a, comparison with a standsrd of definite purity would be more satisfactory than determining the absence of a dass of compounds.AnaIyseEt are given of variou~ commercial samples of ether, in which methy1 compounds range from PO2 to 0*06 per cent., sp. gr. from 07182 to 097211, and ketones (as acetone) from 0.09 to 5-0 parts per 10,000. It is suggested that en apparent 0.05 per cent.limit of methy1 abohol would be reasonable for purified ether made from methylated spirit. A few samples of commercial ether gave practically a negative result in the nitro-prussida test. One sample which had been made from reotified spirit and kept for some time mntained formaldehyde. C.A M. Deteotion of Wheat, Rye, and Potato Starches fn the Presenoe of each other. Em Unna, (Zeitsch.Untmuch. Nahr. G~ertzlssm., 1918,36, 49.)-Ten grms. of the flour are mixed with 3 per cent. phenol solution and, after twenty-four hour#, a portion is transferred to a microscope slide and allowed to dry at the ordinary temperature. The slide is then immersed for ten minuteg in a mixture of mter.320 ABSTRACTS OF CHEMICAL PAPERS blue-oroein solution (water-blue, 1, orcein, 1, glacial acetic acid, 5, glycero1, 20, dcohol, 50, and water, 23 parts) and eosin solution (eosin, 1, 60 per cent. alcohol, 99 parts), washed, immersed for fifteen minutes in 1 per cent.saffrlbnin solutio& well washed, and immersed for tihirtg. minutes in 0.5 per cent. potassium bichromate solution. The preparation is finally washed with water, then with alcohol, treated with xylem, and mounted in Canada balsam.When thus prepared the potato starch is coloured dark red, the wheat starch pink, the rye starch yellow to brown, and the gluten blue. w. P. s. Estimation of Water in Masgarine. BB. MonhaupL (Chm. Z&t., 1919 43, 385-386.)-Loss by spirting when the water is expelled by heating the sample in a, basin over a flame may be prevented by the addition of a small quantity of sodium bioarbonate j about 0.03 grm.of the latter is sufficient for 10 grms. of margarine. The bicarbonate loses about 26 per cent. of its weight during the heating, a, loss which is praotically negligible under the circumstances. w. P. s. Modification of Nessler and Barths Method for the Estimation of Tannin in Wine. L. Meyep. (Mitt. Lebenm. Unterszcck. Hyg., 1918, 9, 131; through Chm. Zeit. Bep., 1919, 43, 125.)-One hundred C.C. of the wine are treated with alcohol to precipitate pectins, filtered, the filtrate evaporated to a, volume of 4 ao., transferred to a sedimentation tube, diluted with water to 5 G.c., and 5 C.C. of saturated sodium chloride solution, ferric chloride solution, and 1 C.C. of 40 per oent. eodium acetate solution are added. After twelve hours, the volume of the sediment is observed and multiplied by 0.33 to obtain the quantity of tannin. In the case of acid wines, the acidity must be reduced, by neutralisation, to less than 0.5 per cent. before the tannin is estimated. w. P. 23.

ISSN:0003-2654    

DOI:10.1039/AN9194400319

出版商:RSC    

年代:1919

数据来源: RSC

摘要:

320 ABSTRACTS OF CHEMICAL PAPERS BACTERIOLOGICAL, PHYSIOLOGICAL, ETC. Aerobic Spore-Forming Baeillus in Tinned Salmon. A. C. Hunter and C. Thorn. (J. Zd. a d B z g . Che~n.~ 1919,11,655-657.)-0f five hundred and thirty trine of mlmon, representing nine brands, examined baoteridogically, two hundred and thirtyseven were unstarile j two hundred and twenty-four of these tins contained the same organism of the mesenterious group either in pure culture or together with othsr speoies.Only thirteen of the tins showed signs of deaomposition. The organiem is an obligate aerobio spore-forming bacillue ; it ie motiIe, produces E) dark red ring about a oentimetre blow the colony when grown in ctwbohydrate medium and dmomposes fish rapidly. The spores are resistant to heat and in broth culture survive heating at 1000 C.for one hour; under 15 lb. pressure in an autocla~e, they survive for fifteen minutea but are killed after thirty minutes. 16 is evideBt that when flze srgmims we embedded in tihe aentre of tho salmon in the tin they may survive lib ordinary sterilising prooeas. Although tinned salmon may contain the living organism without Iilhowing any signs of deaomposition or deMior&tion, wtud ste&ity should be the pmpr aim of the psoker.w. P. s.BACTERIOLOGICAL, PHYSIIOLOGICAL, ETC. 321 Use of Lyoopodium in Quantitative Miorosmpy. T. E. Wallis. ( P h m J., 1919, 103, 75-76.)-Samples of lycopodium powder oonfaibined from 4-25 to 5*9 per cent. of moisture. The number of spores per mgrm. was estinmted by measure- ment and from the sp.gr. (1*086), and dso by mixing a weighed quantify (@bout 0.1 grm.) with olive oil or traga,canth mucilage (10 to 12 grms.), weighing a drop of the mixture on a microscope slide and counting the number sf spores in the drop. The results obtained by the first method ahowed about 95,000 spores per mgrm:, and by fhe seoond averwed 93,000, SO that 94,000 m y be accepted a8 the average number* The use of these results in quantitative microscopy are il1ustra;ted by the following exampIe : Commercial rice starch (0.05 grm.) was mixed with @2 grm. of lpopodium, and counts made under the microscope shoxed 2,761 starch granules for eaeh 100 lycopodium spores.Whence, 2,761 x 94,000+ 100 = 2,595,000 starch granules for each mgrm. of lycopodiurn.Since the mixture contains 4 times as much lycopodium as starch there are 10,380,000 granules in 1 mpm. of air-dried starch, or 12,351,000 in starch dried at 1OOO C. The microsoopic appeaxanae of lycopodium spores is not dtered by boiling with 2 per cent. mid or alkali, end advantage of this fact may be taken in prepclring crude fibre from a mixture of starchy powder and lycopodium.The mixture of crude fibre and lycopodium is collected on a cloth strainer over a watch-glass, mixed with tragacanth mucilage, and counts of the preparation made under the microsoope (cf. ANALYST, 1916, 41, 357). C. A. M. Supposed Occurrence of Methylguanidine in Meat. 1. Greenwald. (J. Amer. Chem. Soc., 1919,41, 1109-1115.)-Methylguanidine, whioh has been isolated from decomposed flesh, has been regarded as one of the toxic substances occurring in fresh meat which has caused poisoning.Ewins (Biochm. J., 1916,1~,103) showed that creatine was oxidised by silver oxide to methylguanidine, but eonoluded that precipitation with mercuric aoetate wag not attended by risk of such oxidation. It has been found, however, by Baumann and Ingvaldsen (J. BhE. Chem., 1918, 35, 277) that crehtinine is oxidised by mercuric acetate, with the formation of methyl- guanidine oxalic acid, and an intermediate product methylguanido-glyoxylio mid, CH,NHC( : NH)NHCOCOOH, whioh melts at 203O C. The author has eonfirmed these reeuIts and concludes that there is no evidence of the occurrence of methyl- guanidiae in meat which is in a fair state of preservation. C. A. M.

ISSN:0003-2654    

DOI:10.1039/AN9194400320

出版商:RSC    

年代:1919

数据来源: RSC

摘要:

BACTERIOLOGICAL, PHYBIOLOGICAL, ETC. 321 ORGANIC ANALYSIS. Chlorination of Benzene. Analysis of Mixtures of Benzene, Chlo~o- benzene and Dichlorobenzene, etc. P. F. Fraakland, S. R. Carter, and D. Webster. (J. SOC. Chm. Id., 1919, 88, 153-154 T.)-The method whieb ww devised for determining the composition of the rewti9n mixtures resultind from the chlorination of bensene on the industrial soale is briefly aa follows : 100 C.O.of the aample are distilled under uniform mniiitions in an Engler flpk, and the distillates are collected in measuring eylindere. Three fractions are obtained by interrupting the distillation at 122O C. and at 142" C. The voluma oE liquid distilling below 122 O C. and above 142 " C. are noted, and the peroentageer of322 ABSTRACTS OF CHEMICAL PAPEM benzene and chlorobenzene preeent in the original mixture are found from a graph ccmstracted from experiments with mixtures of known composition.The dichloro- benzene is found by differenoe. The graph and full details as to procedure are given in the original paper. Benzene hexachloride is sometimes formsd during the chlorina- tion of benzene, and it may be estimated by taking advmtage of its sparing solubility.The fraction boiling above 142" C. contains all the hexachloride, and that portion which crystdlises from this at room temperature is collected, washed with light petroleum, dried, and weighed ; a further quantity may be obtained when the mother- liquor is concentrated. w. P. s. Estimation of Carbon Disulphide. A CPitieal Examination of the Various Nethods usually Employed.P. E. Spielman and Fa B. Jones. ( J . Soc. Ckem. I d , 1919, a, 185-187 TIC.)-The methods examined were those chiefly intended for the estimation of carbon disulphide in benzene. Change in the specific gravity of the benzene, before and after extraction with alcoholic potassium hydroxide ~Iution, gives a trustworthy measure of the amount of carbon disuI- phide present; if the specific gravities are determined acourately to the fourth dsoirnal place, the accuracy of the estimation is about 0.03 per cent.Oxidation of the extracted carbon disulphide with bromine and estimation of the sulphuric acid as barium sulphate is also trustworthy, provided that the oxidation is efficient. Volumetric estimation of the xanthate by titration with copper sulphate solution, or gravimetrically by precipitation as copper xanthate, yield unsatisfactory results; Precipitation by phenylhydrazine of phenylhydrazine pbenyls~lphoc~bazide failed to yield quantitative results w.P. 8. Formation of Cyanie Add during the Oxidation of Organie Substances. R, Fosse. (Comptes r e d . , 1919,169,91-93.)-0n oxidi8ing organic snbstances, such as proteins, dextrose, glycerol or glycoooll, by means of potassium permanganate end ammonia, ammonium cysnate is obtained as an intermediate product of the oxidation.The cymic acid may be identified by converting it into the silver salt, which can be purified by recrystal~islttion. On heating the salt for an haur on the water-bath at about 92' C., with ammonium cthloride dissolved in ammonia, it is deoomposed with the formation of its equivalent of urea.Both the silver chloride and the urea are estimated in the usual way, the urea being estimated in an aliquot portion of the solution. C. A. M. Estimation of Halogens in Organic Compounds by the Liquid Ammonia-Sodium Method. C. W. Clifford. (J. AM. Chm. Soc., 1919, 41, 1051-1060.)-The following modification of the liquid ammonhsodium method ie recommended : From 0.05 to 0-95 grm.of the solid compound (or of the liquid sealed np in a thin-walled glass bulb, which is broken after the addrtion of the ammonia) is treatea in a Dewar flask with liquid ammonia, and metallic sodium introduced lifble by little with constant stirring until a blue coloration persisting for fifteen minutes is obhhed.This completely removes the whole of the halogen from the organic compound, but aIso frequently forms a, small but variable amount of cymide.ORGANIC ANALYSIS 323 The ammonia, is evaporated, the excess of sodium taken up with a little alcohol, and the liquid diluted to about 150 C.C. with water, and filtered if necessary. It is then rendered neutral to phenolphthalem by the addition of 6N acetic acid, and an exce8e of about one C.C.is added. A few glass beads are introduced, and the liquid boiled for about an hour, more water being added if more than about 75 O.C. evaporate- Under these conditions the hydrocyanio acid is quantitatively expelled. The solution is cooled, and the halogen estimated by precipitation with silver nitrate, followed by filtration in most cases, and titration with sodium thiocyanate. In the case of chlorine compounds, the cyanogen formed may be removed by boiling the nitric acid.solution. C. A. M. Estimation of Laetie Acid by Oxidation. 0. Sehuppli (Trav. chh. Aliment. Suzsse de Hyg. Pzib., 1919, 44; Ann. Cham. anal. Appl., 1919, 1, 222.)- Szeberenyi has devised a method of estimating lactic acid by oxidising it by chromic acid into acetic acid, carbon dioxide and water, distilling the acetic acid in a current of steam, and titrating the distillate with standard alkali solution.Other organb acids, including malic, tartaric, and oxalic acids, are completely oxidised tro carbon dioxide and water. I n test experiments it was found that 97 per cent. of lactic acid was oxidised into acetic acid, carbon dioxide, and water, and 3 per cent.completely oxidised to carbon dioxide and water. The author finds that this method gives satisfactory results with solutions of pure organic acids, but that when applied to winee it gives higher results than those obtained with Moslinger’s method, owing to some of the other constituents undergoing incomplete oxidation, and yielding volatile acids.This was confirmed by experiments with cane sugar. C. A. M. Effect of Exposure on Raw Linseed Oil. E. J. Sheppapd. (J. Ind. and Eng. Chm., 1919, 11, 637 639 )-The effect of exposure on the iodine value, acid value, and specific gravity was determined over a, limited range of gain in weight (about 6 per cent. in 85 to 157 days). The thickness of the exposed layer appeared to affect only the rate of change i n the constants, and, for any given increase in weight, the changes occurring in the constants seemed to be independent of the rate of such increase.w. P. s. Analytical Examination of Mercury Fulminate. A. Langhans. (Zeitsch. anal. Chem., 1918, 57, 401 ; through Chem. Zezt. R e p , 1919, 43, 127.)-(1) Ferrous ammonium sulphate-thosulphate reaction.-If 3 grrns.of meronry fulminate are dissolved in 60 C.C. of 10 per cent. thiosulphate solution, and 5 per cent. ferrous ammonium sulphate solution is added, red coloration is obtained ; this soon changes to green, and a yellowish precipitate forms. (2) Sodium nztrite reactson.-A blue- green coloration is obtained when a few drops of a solution of mercury fulminate in potassium cyanide solution are added to 2 per cent.sodium nitrite solution, and the mixture then acidified with dilute hydrochloric acid. (3) Hypobromite reaction.- See following abstract. (4) Vamdate seactzon.-A blue coloration developes when mercury fulminate is dissolved in 20 per cent. hydrochloric acid, and the solution heated with the addition of 1 per cent.arnnonium metavanadate solutiion. (5) Iron324 ABSTRACTS OF CHEMICAL PAPEBS durn reaction.--If 0.3 grm. of fulminate is dissolved in 9 O.C. of 20per cent. hydrochlorio wid, the solution mixed with 1 grm, of iron alum dirrsolved in 30 0.0. of water aontaining 0.5 C.C. of dilute hydrochlario acid, and the mixture diluted with six times its volume of water, a bright cherry-red or blue-red coloration is produced. The reaction may be obtained with 1 part of fulminate dissolved in 8,000 parts of dilute hydrochlorio acid.For the estimation of fulminate the latter is converted into hydroxylamine, formic acid, and mercuric chloride by treatment with hydrochlorio acid, and the hydroxylamine is estimated iodimetrically, or by titration with iron- alum and permanganste; 0.3 grin.of fulminate raquires 91-12 C.C. of ;& iodine solution or 84-48 C.C. of $G permangsnate solution. w. P. s. Reactions of Mercury Fulminate with Chlorate, €&ornate, and Hgpo- bromite. Langhans. (Jour. prakt. Chew&., 1918,98,255 ; through Chm, Zeit. Rep , 1919, 43, 127.)-Potassium chlorate done does not react with mercury fulminate, bnt in the presence of hydroohloria acid it yields traces of a blue-aoloured produot.With potassium bromate much better results are obtained: if 2.5 grma. of the fulminate are dissolved in 3 O.C. of 20 per cent. hydrochloric acid, and 15 C.C. of 5 per cent. potassium bromate solution are added, blue oily drops separate within On8 hour. e reaction of fulminate and hypabromite. A solution of 10 grms.of potassium hydroxide and 4 C.C. of bromine in 100 C.C. of water decomposes fulminate with the evolution of gas and tphe formation of red mercuric oxide; with 12 grms. of potassium hydroxide and 4.2 C.C. of bromine per 100 c.c., the fulminate dissolves with a rapid evolution of gas and yields a green solution. If the fulminate is shaken with a solution containing 10 grms.of potaesium hydroxide and 6 C.C. of bromine per 100 C.C. of water, a, blue-coloured oil is obtained which is soluble in ether. This is poasibly bromonitrosomethane, CH,BrNO. Concentration is a factor in w. P. 5. Use of Pyramidone in Analysb. Eschaieh. (J. Pharm. Chim., 1919, 20, 49-52.)-Nitrates, ferricr chloride, etc., give coloration with pyramidone, and the latter is not, therefore, a specific reagent for the detection of reductsse in blood, mlik, and the like; cf, Thevenon and Rolland, ANALYBT, 1917, 42, 280).If, how- ever, pyridine is also added, pyramidone is a reliable substance to use for the detection of blood, raw milk, etc. A blue coloration is obtained when LI few d r o p of a liquid containiug blood, or 2 C.C. of raw milk, are added to 8, mixture of 1 c.e.of pyridine, 1 C.O. of 10 per oent. pyramidone solution, and 2 drops of hydrogen peroxide. The further addition of a few drops of acetic acid xenders the coloration more stable. Pyramidone may be used for the detection of cyanideel One O.C. of the reagent, 1 C.C. of 05% per cent. copper sulphate solution, and 10 drops of Boetio aoid, yield a blue coloration and turbidity when treated with a dilute solution of cyanide.w. P. s. Tannin Content of Redwood. C. C. Sdione and D. R. Herrill. (J. Id. and Eng. Chm., 1919,11, 643-644.)-Va,rious parts of the wood of the Pac& eos& redwood (Sequoia selrwperuirens) contain the foilowing quantihieg of tannin, etc. :ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . .... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood. The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather.The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent. of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C. of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed. The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed. The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.

ISSN:0003-2654    

DOI:10.1039/AN9194400321

出版商:RSC    

年代:1919

数据来源: RSC

摘要:

ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood. The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather.The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent. of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed.The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed.The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood.The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather. The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent.of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed. The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C.of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed.The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood. The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather.The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent. of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem.Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C. of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed.The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed.The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.ORGANIC ANALYSIS 325 Soluble d i d s ...... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood. The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather.The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent. of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed.The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed.The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood.The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather. The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent.of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C. of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed. The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed. The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.

ISSN:0003-2654    

DOI:10.1039/AN9194400325

出版商:RSC    

年代:1919

数据来源: RSC

摘要:

ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood. The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather.The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent. of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed.The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed.The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood.The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather. The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent.of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed. The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed. The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.

ISSN:0003-2654    

DOI:10.1039/AN9194400330

出版商:RSC    

年代:1919

数据来源: RSC

摘要:

ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood. The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather.The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent. of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed.The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed.The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood.The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather. The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent.of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed. The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C.of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed.The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood. The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather.The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent. of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem.Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C. of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed.The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed.The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.ORGANIC ANALYSIS 325 Soluble d i d s ...... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood. The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather.The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent. of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed.The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed.The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood.The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust. The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather. The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent.of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed. The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C.of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed. The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w.P. s.ORGANIC ANALYSIS 325 Soluble d i d s ... ... ... Non-thmins . . . ... Tannin ... ... . . I I - 1--- Percent. I Per Cent. Per Cent. 2.76 4-77 25-7 1-89 3.63 13.5 0.86 1-15 12.2 Heartwood. The only part of the wood which 4as any possible value as a souroe of tannin is the heartwood; the chief available raw material would be the sawdust.The tannin imparts a dark purplish-brown colour to the outside of hides, but the leather produced might be satisfaotory as a heavy sole leather. The liquor which oolIects an steam-kilning the wood contains from 7 to 10 per cent. of tannin. W. P. S. Estimation of Thiophene. P. E. Spielmann and S. P. Schotz. (J. Soc. Chem. Id., 1919,38,188-189T.)-The authors have examined various met-hods whioh have been suggested for the estimation of thiophene in benzene, and recommend the following modifioations of the basic mercuric sulphate and acetate methods : Basic Mercu/l.ic Szi,&hate Method.-Two C.C.of the benzene and 20 C.C. basic mercuric sulphate solution (sulphuric acid 20 c.c., water 100 ox., and mercuric oxide 5 grms.) axe shaken in a closed tube for three hours; the white precipitate which is formed is collected, washed with hot water, dried at 110" C., and weighed. The weight multiplied by 0.0757 gives the amount of thiophene in 2 C.C. of benzene. Basic Mercuric Acetate Method.---Ten O.C. of the benzene and 4 grms. of baaic mercuric aaetafe (mercuric oxide, 1 part, glacial aceti0 said, 2 parts, the mixture b~iing filtered and the salt washed with ether) are heated on a water-bath under a, reflux condenser for fifteen minutes ; after cooling, the precipitate i8 collected, washed with water, dried at 100" C., and weighed. The weight is multiplied by 0.07516 to obtain the oorresponding amount of thiophene. w. P. s.

ISSN:0003-2654    

DOI:10.1039/AN9194400331

出版商:RSC    

年代:1919

数据来源: RSC