iv SUhlhlARIES OF PAPERS IS THIS ISSUE [December, 1966Summaries of Papers in this IssueThe Determination of Iron(I1) Oxide in Silicate and RefractoryMaterialsPart I. A ReviewSUMMARY OF CONTENTSIntroductionAcid decomposition in a sealed tubeAcid decomposition in an inert atmosphereAcid decomposition in the presence of an oxidantEvolution methodFusion methodCombustion methodConclusionH. N. S. SCHAFERDivision of Coal Research, CSIRO, P.O. Box 175, Chatswood, New South Wales,Australia.Analyst, 1966, 91, 755-762.REPRINTS of this Review paper will soon be available from the Secretary, The Society forAnalytical Chemistry, 14 Belgrave Square, London, S.W.1, a t 5s. per copy, post free.A remittance for the correct amount, made out to The Society for Analytical Chemistry,MUST accompany every order; these reprints are not available through Trade Agents.The Determination of Iron(I1) Oxide in Silicate and RefractoryMaterialsOxide in Silicate MaterialsA description is given of an apparatus of simple construction that canbe made from plastic, in which the decomposition of silicate materials byhydrofluoric acid can be carried out.The procedure for the titration of iron(I1)with dichromate under conditions that eliminate the risk of oxidation isoutlined.A comparison has been made between dichromate titres obtainedpotentiometrically and with diphenylamine sulphonate as indicator. Errorsassociated with the latter in the titration of small amounts of iron(I1) arediscussed. The method of sample decomposition and titration of iron(I1)has been assessed by determining the iron(I1) oxide content of the diabaseW-I, and has been applied to the determination of iron(I1) oxide in slagsfrom a boiler fired with pulverised fuel.H. N.S. SCHAFERDivision of Coal Research, CSIRO, P.O. Box 175, Chatswood, New South Wales,Australia.Part 11. A Semi-micro Titrimetric Method for Determining Iron(I1)Analyst, 1966, 91, 763-770.The Determination of Fluorine or Phosphorus in OrganicCompounds by a Micro-titrimetric MethodA method is described for determining fluorine or phosphorus in organiccompounds synthesised for medical research. After combustion of thecompound in an oxygen flask and absorption of the decomposition productsin water, the contents are diluted with isopropanol, and titrated with thoriumnitrate solution with a Solochrome cyanine R screened indicator.The additionof buffers is unnecessary. The removal of elements that interfere in thetitration of fluorine is also described.F. H. OLIVERChemical Research Department, Parke, Davis & Co., Staines Road, Hounslow,Middlesex.A n ~ l y s t , 1966, 91, 771-774i V SUMMARIES OF PAPERS I N THIS ISSUE [December, 1966Summaries of Papers in this IssueThe Determination of Iron(I1) Oxide in Silicate and RefractoryMaterialsPart I. A ReviewSUMMARY OF CONTENTSIntroductionAcid decomposition in a sealed tubeAcid decomposition in an inert atmosphereAcid decomposition in the presence of an oxidantEvolution methodFusion methodCombustion methodConclusionH.N. S. SCHAFERDivision of Coal Research, CSIRO, P.O. Box 175, Chatswood, New South Wales,Australia.Analyst, 1966, 91, 755-762.REPRINTS of this Review paper will soon be available from the Secretary, The Society forAnalytical Chemistry, 14 Belgrave Square, London, S.W.l, at 5s. per copy, post free.A remittance for the correct amount, made out to The Society for Analytical Chemistry,MUST accompany every order; these reprints are not available through Trade Agents.The Determination of Iron(I1) Oxide in Silicate and RefractoryMaterialsOxide in Silicate MaterialsA description is given of an apparatus of simple construction that canbe made from plastic, in which the decomposition of silicate materials byhydrofluoric acid can be carried out.The procedure for the titration of iron(I1)with dichromate under conditions that eliminate the risk of oxidation isoutlined.A comparison has been made between dichromate titres obtainedpotentiometrically and with diphenylamine sulphonate as indicator. Errorsassociated with the latter in the titration of small amounts of iron(I1) arediscussed. The method of sample decomposition and titration of iron(I1)has been assessed by determining the iron(I1) oxide content of the diabaseW-1, and has been applied to the determination of iron(I1) oxide in slagsfrom a boiler fired with pulverised fuel.H. N. S. SCHAFERDivision of Coal Research, CSIRO, P.O. Box 175, Chatswood, New South Wales,Australia.Analyst, 1966, 91, 763-770.Part 11.A Semi-micro Titrimetric Method for Determining Iron (11)The Determination of Fluorine or Phosphorus in OrganicCompounds by a Micro-titrimetric MethodA method is described for determining fluorine or phosphorus in organiccompounds synthesised for medical research. After combustion of thecompound in an oxygen flask and absorption of the decomposition productsin water, the contents are diluted with isopropanol, and titrated with thoriumnitrate solution with a Solochrome cyanine R screened indicator. The additionof buffers is unnecessary. The removal of elements that interfere in thetitration of fluorine is also described.F. H. OLIVERChemical Research Department, Parke, Davis & Co., Staines Road, Hounslow,Middlesex.Analyst, 1966, 91, 771-774viii SUMMAIIIES 01; PAPICI<S I N THIS ISSUE [December, 1966The Proportion of 2-Methylbutanol and 3- Methylbutanol in someBrandies and Whiskies as Determined by DirectGas ChromatographyStationary phases suitable for the separation of 2-methylbutanol (“active”pentanol) and 3-methylbutanol (isopentanol) are discussed.The mostsuitable for the determination of these alcohols in potable spirits by directinjection of samples are diethyl tartrate and polyethylene glycol 200. Poly-ethylene glycol 200 is preferred because other congeners can be determined a tthe same time. With n-pentanol as an internal standard, 65 samples ofcognac brandies, Scotch and other whiskies have been examined on one orother of these stationary phases.The sum of the two pentanol isomersdetermined separately agrees well with their determination as a single peak onpolyethylene glycol 1500. The ratio of the concentrations of the isomersappears to be characteristic of the type of spirit.D. D. SINGERLaboratory of the Government Chemist, Ministry of Technology, Cornwall House,Stamford Street, London, S.E.l.Analyst, 1966, 91, 790-794.An Instrument for the Continuous Determination of CarbonDioxide in High Purity WaterAn instrument for the continuous determination of carbon dioxide in highpurity water is described. The instrument consists essentially of a device fortransferring the carbon dioxide from the water to a gas stream, which is thenpassed through an aqueous suspension of calcium carbonate.The pH ofthis suspension, which is proportional to the concentration of carbon dioxidein the gas stream and hence the original water, is recorded continuously.Precision tests a t levels of 20 and 60 pg per litre had a standard deviationof about 4pg per litre.K. H. WALLCentral Electricity Generating Board, South Eastern Region, Cockfosters, Herts.Analyst, 1966, 91, 795-801.The Determination of Salt in Bacon by Using a Sodium-ionResponsive Glass ElectrodeRapid determination of the salt content of cured meat products with asodium-ion responsive electrode is described and discussed. The methodenables the percentage of salt on water content to be measured directly on themeat in a few minutes. Many determinations can be made cheaply andaccurately enough for purposes of routine factory control.J.H. HALLIDAYT. Wall & Sons (Meat and Handy Foods) Ltd., Willesden.and F. W. WOODUnilevcr Research Laboratory, Colworth House, Sharnbrook, Bedford.Analyst, 1966, 91, 802-805.Mobile Laboratory Methods for the Determination of Pesticides in AirPart I. PhosphorothiolothionatesShort PaperG. A. LLOYD and G. J. BELLPlant Pathology Laboratory, Hatching Green, Harpendcn, Herts.Analyst, 19GG, 91, 806-808X SUMMARIES OF PAPERS I N THIS ISSUE [December, 1966Mobile Laboratory Methods for the Determination of Pesticides in AirPart 11. ThionazinShort PaperG. A. LLOYD and G. J. BELLPlant Pathology Laboratory, Hatching Green, Harpenden, Herts.Analyst, 1966, 91, 808-809.Determination of Thiourea in Sewage and Industrial EffluentsShort PaperDENIS DICKINSONCity Laboratories Service, Shortley Road, Coventry.Analyst, 1966, 91, 809-811.Absorptiometric Determination of Fenitrothion Residuesin Cocoa BeansShort PaperS.H. YUENImperial Chemical Industries Ltd., Agricultural Division, Jealott's Hill ResearchStation, Bracknell, Berkshire.Analyst, 1966, 91, 811-813.Spectrophotometric Determination of Complexed DibenzoylmethaneShort PaperS. INCITTI and A. LA GINESTRAComitato Nazionale per L'Energia Nucleare, Laboratory F. Giordani, Departmentof Chemistry, University of Rome, Italy.Analyst, 1966, 91, 814-816.Detection of Some 2-Hydroxy and 2-Methoxy Estrogens and OtherShort PaperPhenolic Compounds by a Modified Folin - Ciocalteu TestR.L. RISACHER and A. M. GAWIENOWSKIDepartment of Chemistry, University of Massachusetts, Amherst, Massachusetts.Analyst, 1966, 91, 816-817.A Rapid Infrared Spectrophotometric Method for the Analysisof pp'-DDT in Formulations of Technical DDTShort PaperD. J. HAMILTON and T. J. BECKMANNAgricultural Chemical Laboratory Department of Primary Industries, Brisbane,Queensland, Australia.Analyst, 1966, 91, 817-819December, 19661 THE ANALYST xiN O T I C E TO SUBSCRIBERSThe annual subscription rates for The Analyst and Analytical Abstracts for 1967 and subsequentyears will be as follows-The Analyst plus Analytical Abstracts, including both indexes . . . . . . . . f15 0 0The Analyst, plus Analytical Abstracts printed on one side of the paper only, includingboth indexes .... * . .. .. . . * . . . .. f17 10 0The Analyst, plus Analytical Abstracts printed on one side of the paper only, includingThe Analyst index but excluding the Analytical Abstracts index . .Analytical Abstracts alone, including the index. . . . .. .. . .Analyticof Abstracts printed on one side of the paper only, including the indexAnalytical Abstracts printed on one side of the paper only, without index . .From January Ist, 1967, prices of all single copies will be as follows-Single copies of The Analyst . , .. .. .. .. .. ..Single copies of Analytical Abstracts . . .. * . .. * . ..Single copies of Analytical Abstracts printed on one side of the paper o n l y . .Index t o The Analyst , . .. .. .. .. . . . . ..Index t o Analytical Abstracts . . .. .. .. .. .. -.Prices of unbound complete volumes of back numbers will be as follows-The Analyst, including the index , . .. .. .. .. ..Analytical Abstracts, including the index . , .. .. .. ..Analytical Abstracts printed on one side of the paper only, including the indexAnalytical Abstracts printed on one side of the paper only, without index . .* .. ........ .... ...........f15 15 0f10 0 0f12 0 0f10 10 0€1 10 0fl 2 0fl 10 0f l 10 0f3 15 0f15 15 0f I 2 0 0f16 10 0f12 10