タンニン酸による銅属およびスズ属の完全沈殿pH範囲

木ト 光夫, 吉村 長蔵

doi:10.2116/bunsekikagaku.9.1015

タンニン酸による銅属およびスズ属の完全沈殿pH範囲

DOI Web Site Web Site オープンアクセス

木ト光夫

近畿大学工学部
吉村長蔵

近畿大学理工学部

書誌事項

タイトル別名

Optimum pH ranges for the complete precipitation of copper and tin groups with tannic acid
タンニンサンニヨルドウゾクオヨビスズゾクノカンゼンチンデン pH ハンイ

この論文をさがす

説明

The pH ranges for complete precipitation of copper group (Cu²⁺, Ag⁺ and Au³⁺) and tin group(As³⁺, Sn²⁺, Sb³⁺ and Bi³⁺) by tannic acid havebeen investigated. A quantitative precipitation was observed at pH 4.610.6 for Cu²⁺, for Ag⁺, and 4.29.5 for Au³⁺. The optimum pH ranges for those added with citric acid were 8.010.6 for Cu²⁺, 7.69.2 for Ag⁺, and 4.49.5 for Au³⁺. Also, quantitative precipitation ofthe following ions were possible at pH 7.08.2 for As³⁺, 1.79.4 for Sn²⁺, 2.59.8 for Sb³⁺, and >4.8 for Bi³⁺. By application of the differences of pH range for the quantitative precipitation, separations of each were made as follows: Sn and Bi at pH >11.4, Sb and Bi at >11.6, As and Bi at 4.55.0, and >9.5, As and Sb at3.05.0 and 9.29.8, and As and Sn at 1.84.8 and 9.29.6.