Authors:
Ph. Albert Laboratoire d’analyse par activation du Centre d’Etudes de Chimie Métallurgique du CNRS Vítry (France)

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J. Blouri Laboratoire d’analyse par activation du Centre d’Etudes de Chimie Métallurgique du CNRS Vítry (France)

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Ch. Cleyrergue Laboratoire d’analyse par activation du Centre d’Etudes de Chimie Métallurgique du CNRS Vítry (France)

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N. Deschamps Laboratoire d’analyse par activation du Centre d’Etudes de Chimie Métallurgique du CNRS Vítry (France)

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J. Le Hericy Laboratoire d’analyse par activation du Centre d’Etudes de Chimie Métallurgique du CNRS Vítry (France)

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Abstract  

The analytical procedure for the determination of sulfur in copper by activation with thermal neutrons is given. The purifications necessary to obtain a radiochemically pure precipitate of baryum sulphate are described. The occurrence of some discrepant values in the determinations led to the observation, for the first time, of abnormally high contents of35S* at a relatively important depth in the samples of irradiated copper (as deep as about 300 μ). Therefore it is necessary to etch the samples to a depth of 300 μ at least on each surface, before doing the chemical separations. Owing to the great influence of the reaction35Cl(n,p)35S*, the determination of sulfur by thermal neutrons is only possible at contents higher than 10−6, even if the chlorine concentration is very low (2·10−8 Cl introduces a correction in terms of sulfur of the order of 10−6). For sulfur contents lower than 10−6, the determination is made by irradiation in fast neutrons. The analytical procedure is described and the corrections in the presence of phosphorus and chlorine are discussed. At contents of the order of 10−8, the corrections are very small and the determination of some 10−7 of sulfur is easy. Finally, the determination of phosphorus in copper by activation in thermal neutrons is given. The chemical separations are the same as in the preceding case. Contents of the order of 10−8 phosphorus are determined without difficulty. The results of the determination of sulfur and phosphorus in many samples of copper are indicated: OFHC copper, High Purity copper (99.999%) and different samples of zone refined copper prepared at the Vitry’s Laboratory.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)