【摘要】 本文提出了在聚乙烯醇（ＰＶＡ）存在下采用铋（Ⅲ）－硫氰酸盐－甲基紫显色体系测定痕量铋的方法．在ｐＨ＝１．０～３．０条件下，λａｍｘ＝６００ｎｍ，灵敏度高（ε＝７．２５×１０５），选择性好，除Ｆｅ（Ⅲ）、Ｃｕ（Ⅱ）、Ｓｂ（Ｖ）、Ｓｎ（Ⅳ）、Ｍｏ（Ⅵ）外其余离子基本元干扰，线性范围１．４～１０μｇ／２５ｍｌ，测定了铅中痕量铋，结果人满意．更多还原

【Abstract】 A new method for determination of trace bismuth by the ternary reaction system of Bi-sulphur-cyanate-methyl violet in the presence of polyvinyl alcohol is propvsed in this paper. The sensitivity is high and selectivity is good under PH 1. 0～3. 0 and λmax600 nm. Besides Fe(Ⅲ) .Cu (Ⅱ) .Sb (Ⅴ) .Sn(Ⅳ) .Mo(Ⅵ)the other ion don’t disturb busically. The linear range is 1.4～10 mg/25ml. The result of deter mination of trace bismuth in pure lead satisfied.更多还原