交流ポーラログラフ法による粗銀中のビスマスおよび鉛の分析

概要

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An analytical method for the determination of bismuth and lead in crude silver by A. C. polarography has been investigated. Bismuth and lead were separated from the silver by coprecipitation with ferric hydroxide, and determined simultaneously by the A. C. polarographic method after the precipitate had been dissolved in 1 <I>N</I> HCl. The presence of the large amount of iron added for the separation and of other elements in the silver did not interfere with the determination.<BR>An analytical method based on these procedures was developed and the analytical results by this method were compared with those obtained by the photometric method for bismuth and the emission spectrographic method for lead. The agreement was very satisfactory.<BR>It was confirmed that the A. C. polarographic method has an advantage over the D. C. polarographic method for the determination of bismuth and lead in silver, in particular, when their concentration is small, because the wave forms of the A. C. polarograms are better-defined for the measurement.
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