ポーラログラフ法による鉛地金中の銅,ビスマスの迅速定量法
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Since bismuth forms stable complexes with EDTA, NTA (nitrilotriacetic acid) and other chelating agents in nitric acid solution, the bismuth-complex step can be shifted from the copper step even in the presence of large amount of lead.<BR>The most suitable concentrations of nitric acid and NTA have been sought by the authors for the determination of copper and bismuth.<BR>The influence of interfering elements, e. g., tin and antimony are eliminated by oxidation with a few drops of 1% potassium permanganate. By this method, copper and bismuth in pure lead can be determined directly and simultaneously.<BR>The base solution is composed of 0.1 <I>N</I> HNO<SUB>3</SUB>+0.005<I>M</I> NTA+0.04% CMC (sodium carboxymethylcellulose) and the half-wave potentials of copper and bismuth are+ 0.004 V and -0.14 V <I>vs</I>. S. C. E. respectively.<BR>The time required for an analysis is about 1.5 hour.
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