铋(Ⅲ)—硫氰酸盐—孔雀绿高灵敏显色体系的研究

Study on High Sensitive Colour Reaction of Bi (Ⅲ)-SCN~—MG—PVA System

文中推荐了一个用于分光光度测定痕量铋的灵敏方法,其测定范围为1～20μgBi(Ⅲ)/50ml。该方法已用于纯铅和铅黄铜中铋的测定,结果令人满意。

A sensitive method for the spectrophotometric determination of trace bismuth is studied. In solu~ tjon containing 0.01-0.04 M H2SO4, in the presence of polyvinyl alcohol(PVA), Bi (Ⅲ), KSCN and malachite green (MG) f orm a soluble mixed ion associated complex. The complex is measured at 620 am with a molar absorptivity of 7.1x105. The system obeys Beer's law in the range of 1-20g Bi(Ⅲ) /50ml. The method has been used for the determination of trace bismuth in pure lead and alloy