摘要:

AbstractConflicting interpretations are found in the literature of polarograms of copper (II) in thiocyanate solutions. In the present study it is shown that the polarograms change with concentration of thiocyanate and time of aging of the solutions when the thiocyanate concentration is greater than about 0.1M.A wave appearing at the most negative potential (half‐wave potential −1.5 Vvs.SCE), which is attributed in the literature to the reduction of copper (I) to copper metal or to a catalytic reaction, is actually due to the reduction of hydrogen ions produced as a result of reduction of copper (II) by thiocyanate i

ISSN:0165-0513    

DOI:10.1002/recl.19600790602

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractAn isotope dilution procedure using185W has been developed for the determination of tungsten in high alloy steels. Tungsten is determined spectrophotometrically with hydroquinone in sulphuric acid medium, after homogeneous precipitation from a nitric acid‐hydrogen peroxide solution.For molybdenum‐vanadium‐tungsten alloy steels no further chemical separations are required. The radiometric correction is applied to the residual tungsten so as to minimize counting errors. Analyses carried out on N.B.S. samples showed good accuracy and precision.For high alloy steels containing niobium, tantalum and titanium a chemical separation of tungsten is necessary to avoid interference in the subsequent spectrophotometric determination. Although the recovery of tungsten is quite low, the magnesia method is entirely satisfactory.The method was succesfully tested on a number N.B.S. high alloy steels to which varying amounts of tantalum and titanum were

ISSN:0165-0513    

DOI:10.1002/recl.19600790603

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractAu cours du prèsent travail, nous avons établi les constantes de dissociation thermodynamiques des acides sébacique (pk1= 4,40, pk2= 5,22) et tétrachlorophtalique (pk1= fort, pk2= 2,94). De même, nous avons déterminé les solubilités des sébacates et des tétrachlorophtalates du thorium et des terres cériques, ce qui nous a permis de calculer les produits de solubilité théoriques co

ISSN:0165-0513    

DOI:10.1002/recl.19600790604

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractTri‐isodecylamine is proposed as a versatile reagent for extracting inorganic anions from aqueous solution: its use in the determination of silica is described. The advantages of a non‐aqueous extraction method are discussed and full instructions given for the determination of silica in anhydrite and the l

ISSN:0165-0513    

DOI:10.1002/recl.19600790605

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractGas hydrates of nitrogen and oxygen are described.P‐trelations of the three‐phase equilibria in the system nitrogen ‐ water are given from ‐ 4 to 18°C at pressures up to 1000atm. The dissociation pressure of oxygen hydrate is give

ISSN:0165-0513    

DOI:10.1002/recl.19600790606

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe solubilities of some aromatic hydrocarbons in pyridine have been measured. The entropies of fusion derived from these measurements agree qualitatively with the values which can be calculated, if it is assumed that their molecules obtain one rotational and three translational degrees of freedom when melting occurs.

ISSN:0165-0513    

DOI:10.1002/recl.19600790607

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractIt was desired to increase the ratio of the amounts of nickel and cobalt with respect to iron, as found in lateritic iron ores and to recover almost all the nickel and cobalt in these ores.This was realised by converting nickel oxide and cobalt oxide almost selectively and completely into the corresponding chlorides. A stepwise process was used in which a gaseous mixture of steam and hydrogen chloride was passed through a fluidised bed of the granulated ore under proper conditions of temperature and concentration. The chlorides were recovered by extracting the chloridised ore with hot water.

ISSN:0165-0513    

DOI:10.1002/recl.19600790608

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractO,N,N‐tribenzyl‐glycerol‐α‐kephalins have been obtained in two diastereoisomeric forms. Upon hydrogenolysis the two isomers give the same kephalin.This diastereoisomerism, due to the presence of an asymmetric carbon atom and an asymmetric phosphorus atom, is discussed in som

ISSN:0165-0513    

DOI:10.1002/recl.19600790609

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe accuracy of acid‐base titrations in aqueous and non‐aqueous media can be considerably improved by making use of a spectrophotometric with the addition of indica

ISSN:0165-0513    

DOI:10.1002/recl.19600790610

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractRadiometric determination of uranium and of thorium in their compounds can be effected in principle by gamma counting with a scintillation spectrometer.The complications that arise when the radioactive equilibrium with the daughter products in the samples to be analysed is not established, are discussed.

ISSN:0165-0513    

DOI:10.1002/recl.19600790611

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY