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本文研究了Bi(Ⅲ)～3.5-Br_2-PADAP-OP体系的显色反应,在PH_2 的高氯酸介质中立即生成兰色络合物,λ_(max)=595nm,ε_(595)=9.9×10~4。在0-30μg/ml范围内服从比尔定律,络合物的组成为Bi(Ⅲ)∶3.5-Br_2-PADAP=2∶3. 本文还研究了用巯基棉从铜及其他金属离子中分离鉍(Ⅲ);此法已用于测定纯锌及钴盐中微量鉍。
The color reaction of Bi (Ⅲ) ~ 3.5-Br_2-PADAP-OP system was studied in this paper. The blue complex was formed immediately in PH 2 perchlorate medium with λ max = 595 nm and ε 595 = 9.9 × 10 ~ 4. Beer’s law is obeyed in the range of 0-30μg / ml, and the composition of the complex is Bi (Ⅲ): 3.5-Br_2-PADAP = 2: 3. The paper also studied the separation of bismuth from copper and other metal ions Ⅲ); This method has been used to determine trace amounts of bismuth in pure zinc and cobalt salts.