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-1HCl和2.0 mol.L-1NH4NO3+0.5 mol.L-1NH3.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1.4μg.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。
For the separation and determination oI 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·L^-1 HCl and 2. 0mol·L^-1 NH4NO3 ＋0. 5 mol·L^-1 NH3· 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 1.4μg · 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%.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2007年第1期165-168,共4页
Spectroscopy and Spectral Analysis
基金
上海市科委基础研究重点项目(05JC14059)
国家自然科学基金项目(50478103)资助
