Determination of traces of lead in high-purity metals

Lead chromate has low solubility and thus chromate is useful as a precipitating agent for lead. Barium chromate coprecipitates well with lead chromate and thus it can be used as a coprecipitating agent. The sample is converted, directly or indirectly, into perchlorate. Coprecipitation with barium ch...

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Bibliographic Details
Published inBUNSEKI KAGAKU Vol. 8; no. 9; pp. 576 - 582
Main Authors YANAGIHARA, Tadasi, MATANO, Nobuhisa, KAWASE, Akira
Format Journal Article
LanguageEnglish
Japanese
Published Tokyo The Japan Society for Analytical Chemistry 1959
Japan Science and Technology Agency
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Summary:Lead chromate has low solubility and thus chromate is useful as a precipitating agent for lead. Barium chromate coprecipitates well with lead chromate and thus it can be used as a coprecipitating agent. The sample is converted, directly or indirectly, into perchlorate. Coprecipitation with barium chromate is effected in ammonia alkaline solution for those samples containing copper, zinc and silver, and in slightly alkaline solution for those containing nickel and magnesium. The chromium is dissolved and oxidized to chromic acid with perchloric acid, and barium salt is added in dilute acetic acid solution for coprecipitation. The mixture of copreciptated barium chromate and lead chromate is treated with perchloric acid-hydrochloric acid mixture to remove chromium, and the lead is determined spectrophotometrically with dithizone, or by a polarographic method (square-wave polarograph) using hydrochloric acid as a supporting electrolyte. Several microgram quantities of leadin high purity metals can be determined by this method.
ISSN:0525-1931
DOI:10.2116/bunsekikagaku.8.576