铜与2-羟基-3-羧基-5-磺酸基苯重氮氨基偶氮苯反应的分光光度法研究及应用  

SPECTROPHOTOMETRIC STUDIES ON AND APPLICATIONS OF THE REACTION OF COPPER WITH 2 HYDROXY 3 CARBOXY 5 SULFOBENZENEDIAZOAMINOAZOBENZENE

作　　者：郭忠先[1,2] 蔡蜀穗[1,2] 

机构地区：[1]南开大学化学系 [2]天津四川轻工学院化工系

出　　处：《光谱学与光谱分析》1997年第6期108-112,共5页Spectroscopy and Spectral Analysis

基　　金：四川省教委科研基金

摘　　要：研究了铜与２－羟基－３－羧基－５－磺酸基苯重氮氨基偶氮苯（ＨＣＳＤＡＡ）的显色反应。在Ｔｒｉ－ｔｏｎＮ－１０１存在下和ｐＨ１０．４～１１．５的缓冲介质中，Ｃｕ２＋与ＨＣＳＤＡＡ形成１∶２的红色配合物，其最大吸收波长是５３０ｎｍ，对比度为１０２ｎｍ，表观摩尔吸光系数为１．３１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。铜在０～０．２４μｇ／ｍＬ范围内服从比尔定律。用于铅锌矿和花生中微量铜的测定，相对误差不大于３．７％，相对标准偏差不大于１．６％（ｎ＝６）。A highly sensitive color reaction of copper(Ⅱ) with 2 hydroxy 3 carboxy 5 sulfo benzenediazoaminoazobenzene(HCSDAA)in the presence of Triton N 101 was studied in detail.ln borax buffer medium at pH 10 4—11 5,the red complex formed has a maximum absorption at 530nm and its apparent molar absorptivity is 1 31×10 5L·mol -1 ·cm -1 and sandell sensitivity is 4 85×10 -4 μg·cm -2 .The molar ratio of copper(Ⅱ) to HCSDAA in the complex is found to be 1∶2.Beer′s law is obeyed in the concentraction range of 0—0 24μg/mL for copper.The proposed method has been applied to the spectrophotometric determination of microamounts of copper in ore and peanut with the relative error and the relative standard deviation (n=6) of less than 3 7% and 1 6%,respectively.

关 键 词：铜 分光光度法 HCSDAA 显色反应 

分 类 号：O614.121[理学—无机化学]