催化-分光光度测定超痕量的铜

SPECTROPHOTOMETRIC DETERMINATION OF ULTRATRACEAMOUNTS COPPER(Ⅱ)BY A NEW AND HIGH SENSITIVELY CATALYTIC REACTION

测定Cu^(2+)的催化反应不下三十种,但灵敏度大多低于ng Cu^(2+)/ml,关于这方面的工作,国内亦有综述。实用上测定Cu^(2+)研究较多的催化反应是H_(2)O_(2)氧化对氨基苯磺酸及H_(2)O_(2)氧化氢醌,它们均用吡啶或联吡啶作活化剂。最近报导了一些测定Cu^(2+)的催化反应,大多也有灵敏度不够高.

In this paper,varieous conditions,suitable for determining ultratracea-mounts of Cu^(2+)when mixed reductant of sulphanilic acid andα-naphthyl-amine is oxidized by H_(2)O_(2) using as a catalytic reaction,have been examined in detail.The sensitivity of this method presented as apparent molar absorptivity equals 1.25×10^(7).The interference of many common ions can be separated by precipitating with ammonia.Trace amounts of Cu^(2+)in some high-purity reagents,such as NaCl,LiCl.H_(2)O,were determined by this method with satisfactory results.