环境水样中各形态铬的水解分离-FAAS法分析  

Speciation analysis of Chromium(Ⅵ) and Chromium(Ⅲ) in water sample using flame atomic absorption spectrometry with hydrolysis separation system

作　　者：肖开提·阿布力孜[1] 阿布力孜·伊米提[1] 王吉德[1] 艾斯卡尔·买买提 

机构地区：[1]新疆大学化学化工学院,乌鲁木齐830046 [2]新疆克拉玛依石化公司保洁车间,克拉玛依834003

出　　处：《分析试验室》2008年第7期62-64,共3页Chinese Journal of Analysis Laboratory

基　　金：新疆大学校院联合基金(070196)项目资助

摘　　要：研究了痕量铬形态分析的水解分离-原子吸收光谱法。根据Cr2O7^2-和Cr（Ⅲ）水解特性的不同，将含有Cr（Ⅵ）和Cr（Ⅲ）的试样pH调至6，此时以Cr2O7^2-形式存在的Cr（Ⅵ）不产生水解沉淀，而Cr（Ⅲ）产生水解沉淀，从而得到Or（Ⅵ）和Or（Ⅲ）的分离，对清液中的Or（Ⅵ）和用酸溶解沉淀所得溶液中的Or（Ⅲ）进行从S测定，可求得Or（Ⅵ）和Or（Ⅲ），方法的加标回收率分别在98．5％～105％和92．6％～99．2％之间，相对标准偏差分别为1．3％和1．9％，检出限为0．25mg／L。A rapid and sensitive method for sequential determination of Cr（ Ⅵ ） and Cr（Ⅲ ） in water samples based on flame atomic absorption spectrometry with hydrolysis separation system has been developed. In the proper acidity, chromium in different kinds of speciation was separated by using hydrolysis acidity. The pH of sample containing chromiuin in different kind of speciation was adjusted to 6 by using acidic solution, at pH 6 medium, Cr（ Ⅲ ） were precipitated as hydrolysis precipitation, Cr（ Ⅵ ） remained in solution was determined by AAS. After that, hydrolysis precipitation of Cr（ Ⅲ ） was solvated by adding sulfuric acid with pH = 1 as solvent and was determined by AAS. The recoveries are 98.5% - 105% for Cr（ Ⅵ ） and 92.6% - 99.2% for Cr（ Ⅲ ）. The relative standard deviations were 1.26%, 1.86%. The detection limit is 0.25 mg/L.

关 键 词：水解分离 原子吸收光谱法 铬 形态分析 

分 类 号：O657.3[理学—分析化学]