一种Cr(Ⅵ)的新显色反应及其在环境水样分析中的应用  

A New Colour Reaction of Chromium(Ⅵ) and Its Analytical Application in Environmental Water

作　　者：尹家元[1,2] 杨光宇[1,2] 尹宁[1,2] 徐其亨[1,2] 

机构地区：[1]云南大学化学系 [2]南开大学元素有机化学研究所

出　　处：《环境科学》1998年第2期74-76,共3页Environmental Science

基　　金：云南省教委自然科学基金

摘　　要：合成了超高灵敏显色剂二安替比林对乙氧基苯基甲烷（ＤＡｐＥＭ），在磷酸介质中，Ｍｎ（Ⅱ）存在下，ＤＡｐＥＭ与Ｃｒ（Ⅵ）生成黄色产物，λｍａｘ＝４５０ｎｍ，ε＝１．３６×１０６Ｌ（ｍｏｌｃｍ）－１．铬（Ⅵ）含量在２—３２μｇ／Ｌ内符合比尔定律，用于环境水样中Ｃｒ（Ⅵ）的测定，结果满意．Diantipyryl (p ethoxy) phenylmethane(DApEM) has been synthesized and identified.A study on superhighly sensitive colour reaction of Cr(Ⅵ)with DApEM has been carried out.In the presence of Mn(Ⅱ),Cr(Ⅵ) can react with DApEM to form a yellow product in phosphoric acid medium.Maximum absorbance is at 450 nm with molar absorptivity of 1 36×10 6L·(mol·cm) -1 .Beer's law is obeyed in the range of 2—32 μg Cr(Ⅵ)/L.This method has been satisfactorily applied to determination of chromium (Ⅵ) in environmental water.

关 键 词：铬 显色反应 水质监测 环境水样 

分 类 号：X832.02[环境科学与工程—环境工程]