速差动力学同时测定铬(Ⅵ)和铬(Ⅲ)的研究  

Study on Simultaneous Determination of Chromium(Ⅵ) and Chromium(Ⅲ) by Differential Reaction rare Kinetic Analysis

作　　者：郭忠先[1] 

机构地区：[1]四川轻化工学院化工系

出　　处：《分析试验室》1997年第3期14-17,共4页Chinese Journal of Analysis Laboratory

基　　金：四川省教委科研基金

摘　　要：基于铬（Ⅵ）和铬（Ⅲ）与５′－硝基水杨基荧光酮、溴化十六烷基三甲铵的显色反应速度差异，在ｐＨ５．７～６．２和６５℃加热条件下用速差动力学比例方程法同时光度测定铬（Ⅵ）和铬（Ⅲ）。两配合物均为假一级动力学形成反应，表观活化能分别为４９．０９ｋＪ／ｍｏｌ和１０３．６８ｋＪ／ｍｏｌ。测定铬（Ⅵ）和铬（Ⅲ）的线性范围分别为０～０．２０ｍｇ／Ｌ和０～０．６５ｍｇ／Ｌ。方法用于废铬酸洗液中铬（Ⅵ）和铬（Ⅲ）的同时测定，结果较满意。A differential reaction rate kinetic spectrophotometric procedure has been proposed for the simultaneous determination of chromium(Ⅵ) and chromium(Ⅲ).It is based on the difference of rates in the formation of ternary complexes of the two ions with 2,6,7 trihydroxy 9 (2' hydroxy 5' nitro) phenylfluorone 3 and hexadecyltrimethylammonium bromide in phosphate medium at pH 5.7～6.2 and heated in a water bath at 65℃.The calibration ranges for the determination of Cr(Ⅵ) and Cr(Ⅲ) are 0～0 20mg/L and 0～0 65mg/L,respectively.The method of proportional equations has been satisfactorily applied to the analysis of several synthetic mixtures and waste chromic acid washing liquis.

关 键 词：污水 铬 速差动力学分析 价态分析 分光光度法 

分 类 号：X132[环境科学与工程—环境科学] X832.02