催化极谱法直接快速测定高纯铅中痕量砷

DIRECT AND RAPID DETERMINATION OF TRACES OF ARSENIC IN PURE LEAD BY CATALYTIC POLAROGRAPHY

在８羟其喹啉—抗坏血酸—硫酸钴的硫酸介质中，Ａｓ（Ⅲ）产生灵敏的极谱催化波，其导数峰电位为－１１３Ｖ（ｖｓ．ＳＣＥ）。Ａｓ（Ⅲ）浓度在０００１～００２ｍｇ／Ｌ范围内，峰高与浓度呈线性关系，检出限为００００６ｍｇ／Ｌ，该方法已用来测定高纯铅中痕量砷，结果令人满意。

In a system of 8hydroxyquinoline—ascorbic acid—CoSO4, As(Ⅲ) produces a sensitive catalytic polarographic wave with a peak potential of -113 V(vs. SCE). In the range 0001～002 mg/L, the differential peak height is linearly related to the concentration of As(Ⅲ) and the detection limit is 00006 mg/L. The method has been applied in the determination of arsenic in pure lead, obtaining satisfactory results.