光度法测定水中微量镉
收稿日期: 2001-10-07
网络出版日期: 2010-10-01
Spectrophotometric determination of trace cadmium in water
Received date: 2001-10-07
Online published: 2010-10-01
在pH为9的硼砂-盐酸缓冲溶液中,DSPCF与镉生成蓝色络合物,最大吸收波长为610nm,测得表观摩尔吸光系数为5.76×104L/(mol·cm)。镉量在01.6mg/L内符合比耳定律。采用甲基膦酸二甲庚脂-HBr体系萃取色层分离微量镉,以提高方法的选择性,该法用于测定水中微量镉,获得了满意的结果
关键词： 镉; 1,5-二-(2-羟基-5-磺基苯基)-3-氰基甲月替; 分光光度法
朱理哲 . 光度法测定水中微量镉[J]. 工业水处理, 2002 , 22(4) : 47 -48 . DOI: 10.11894/1005-829x.2002.22(4).47
The blue complex of cadmium(Ⅱ)wi th 1,5 -di -(2 -hydroxy -5 -sulfophenyl)-3 -cy anoformazan disodium salts (DSPCF)is formed in a buffer solution of bo rax -hydrochloric acid(pH 9).The complex has a maximum absorption waveleng th at 610 nm.The apparent molar absorptivity is 5.76 ×104 L/(mol?cm).The trace cadmium is ex trasted with di-(1 -methy lheptyl)methylphosphonate -HBr by chromatog raphy separat ion,to improve the selectivi ty.The method has been applied to the determination of trace cadmium in water with satisfactory result s.
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