新试剂（MSBTAMB）双波长光度法测定微量铜（Ⅱ）的研究  

Dual-wavelength Spectrophotometric Determination of Trace Copper (Ⅱ) with 2-[2'-(6'-Methylsulfonylbenzothiazolyl)azo]-5-dimethylaminobenzoic Acid

作　　者：何巧红[1] 朱有瑜[1] 刘波[1] 

机构地区：[1]杭州大学化学系,华东师大化学系

出　　处：《分析测试学报》1996年第5期17-21,共5页Journal of Instrumental Analysis

基　　金：浙江省自然科学基金

摘　　要：研究了新试剂２－〔２＇－（６＇－甲磺酰－苯并噻唑）偶氮〕－５－二甲氨基苯甲酸（ＭＳＢＴＡＭＢ）与铜（Ⅱ）的显色反应。试验表明，在ｐＨ２．０～５．１和４０％乙醇介质中，Ｃｕ（Ⅱ）与ＭＳＢＴＡＭＢ形成１＋１稳定的配合物，其最大吸收波长为６４２ｎｍ，用单波长法测得配合物的Σ（６４２）＝６．７４×１０４·ｍｏｌ－１·ｃｍ－１，双波长法测得的Σ（６４２，５４６）＝１．０９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。铜量在０～０．７２μｇ／ｍＬ范围内合符比尔定律。制定的方法用于人发和纯铝中微量铜的测定，结果满意。The color reaction of a new reagent 2-[2'-(6'-methylsulfonylbenzothiazolyl)azo]-5-dimethylaminobenzoic acid(MSBTAMB) with copper(Ⅱ) is described.In an urotropin-HCl buffer at PH 2.0～5.1 with 40% alcohol solvent.Cu(Ⅱ) reacts with MSBTAMB to form an 1+1 stable complex.Its maximurn absorption wavelength is 642 nm,while the molar absorptivity ε(642) is 6.74×104L·mol-1·cm-1.Under a dual-wavelength mode with a reference wavelength of 546 nm,the molar absorptivity ε(642,546) is 1.09×105L·mol-1·cm-1.In the range of 0～0.72μg/mL,Beer's law is obeyed.The method is highly sensitive and selective.and has been satisfactorily applied to the direct determination of trace copper in pure aluminum and human hair samples.

关 键 词：铜 甲磺酰 光度法 苯 噻唑偶氮苯甲酸 

分 类 号：O614.121[理学—无机化学] O657.32[理学—化学]