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弱碱性阴离子交换树脂富集ICP-AES测定环境水体中Cr(Ⅵ)和有机态Cr(Ⅲ)的研究
引用本文:马红梅,朱志良,张荣华,赵建夫.弱碱性阴离子交换树脂富集ICP-AES测定环境水体中Cr(Ⅵ)和有机态Cr(Ⅲ)的研究[J].光谱学与光谱分析,2007,27(1):165-168.
作者姓名:马红梅  朱志良  张荣华  赵建夫
作者单位:同济大学污染控制与资源化研究国家重点实验室,上海,200092
基金项目:上海市科委资助项目 , 国家自然科学基金
摘    要:选用331弱碱性阴离子交换树脂,对微污染水体中的Cr(Ⅵ)和有机态Cr(Ⅲ)进行了分离富集作用研究,考察了酸度、富集时间、洗脱液类型、洗脱液浓度及溶液中共存离子对分离富集过程的影响.研究表明,分别用1.0 mol·L-1 HCl和2.0 mol·L-1 NH4NO3 0.5 mol·L-1 NH3·H2O可以很好分步洗脱有机态Cr(Ⅲ)和Cr(Ⅵ),利用ICP-AES测定,该方法对Cr(Ⅲ)和Cr(Ⅵ)的检出限分别为1.1和1.4 μg·L-1,相应的相对标准偏差RSD(n=6)平均值分别为3.8%和5.6%.该方法适用于自来水、地下水、地表水及生活污水中痕量Cr(Ⅵ)和有机态Cr(Ⅲ)的分离富集及测定.

关 键 词:弱碱性阴离子交换树脂  分离富集  有机态Cr(Ⅲ)  Cr(Ⅵ)  ICP-AES
文章编号:1000-0593(2007)01-0165-04
收稿时间:2005-11-01
修稿时间:2006-03-16

Separation of Cr(Ⅵ) and Organic Cr(Ⅲ) in Natural Water by Weak Basic Anion Exchange Resin and Determination by ICP-AES
MA Hong-mei,ZHU Zhi-liang,ZHANG Rong-hua,ZHAO Jian-fu.Separation of Cr(Ⅵ) and Organic Cr(Ⅲ) in Natural Water by Weak Basic Anion Exchange Resin and Determination by ICP-AES[J].Spectroscopy and Spectral Analysis,2007,27(1):165-168.
Authors:MA Hong-mei  ZHU Zhi-liang  ZHANG Rong-hua  ZHAO Jian-fu
Institution:State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China
Abstract:For the separation and determination of inorganic Cr(VI) and organic Cr(III) in natural water, a sensitive and selective method was developed using a weak basic anion exchange resin micro-column and inductively coupled plasma atomic emission spectrometry (ICP-AES). Under optimized conditions, organic Cr(III) and inorganic Cr( VI) were retained on the column, and eluted with 1. 0 mol x L(-1) HCl and 2. 0 mol x L(-1) NH4 NO3 +0. 5 mol x L(-1) NH3 x H2O respectively. Then the concentrations of Cr(VI) and organic Cr(III) were determined by ICP-AES. The detection limits of organic Cr( III ) and inorganic Cr(VI) were 1. 1 and 1. 4 microg x L(-1) , and relative standard deviations(RSD) were 3. 8% and 5. 6% respectively. The proposed method has been applied to the determination and separation of chromium in several practical water samples with a recovery between 90. 4% and 106. 3%.
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