多元校正-紫外-可见分光光度法同时测定铬(Ⅵ)和铬(Ⅲ)  

Simultaneous Determination of Chromium (Ⅵ) and Chromium (Ⅲ) by Ultraviolet-visible Spectrophotometry With Multivariate Calibration

作　　者：汤桂娜[1] 贺仕军 王保宁[1] 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《分析化学》1995年第4期383-386,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金

摘　　要：本文研究在pH3.0～4.0,70～80℃加热条件下,Cr(Ⅱ)与EDTA形成紫色络合物,其最大吸收波长为537.5nm,而在此条件下,Cr(Ⅵ)几乎不与EDTA反应,利用Cr(Ⅱ)络合物和Cr(Ⅵ)离子本身吸收光谱间的差异,借助于最小二乘(K—矩阵)法解析两物种吸收光谱的重叠问题,进而建立了多波长同时光度测定Cr(Ⅱ)和Cr(Ⅵ)的方法,用于合成试样、电镀废液及废铬酸洗液中Cr(Ⅵ)和Cr(Ⅱ)的同时测定,获得满意结果.At pH 3. 0-4. 0 and for heating at 70-80℃ , Cr(Ⅲ) reacts with EDTA to form a colour complex (λmax= 537. 5 nm) while Cr( Ⅵ ) does not react with one. Based on the difference of the absorption spectra of Cr ( Ⅳ ) and Cr ( Ⅲ )-EDTA complex, a simple effective method for the simultaneous determination of Cr ( Ⅲ ) and Cr ( Ⅳ ) was-proposed by using multivariate calibration (K-matrix method) for resolving the overlapped spectra. The method has been applied to the simultaneous determination of Cr(Ⅲ) and Cr(Ⅵ ) in waste electroplate solution and waste chromic acid mixture with satisfactory results.

关 键 词：价态分析 分光光度法 铬 EDTA 

分 类 号：O614.611[理学—无机化学] O657.32[理学—化学]