双微柱在线富集-火焰原子吸收光谱法测定环境水样中痕量镉  

Determination of Trace Cadmium in Environment Water Samples by Flame Atomic Absorption Spectrometry Using Flow Injection On-Line Preconcentration with Double Microcolumns

作　　者：康维钧[1] 梁淑轩[2] 贾丽辉[3] 许丽琴[1] 赵岩[1] 孙汉文[2] 

机构地区：[1]河北医科大学公共卫生学院,河北石家庄050017 [2]河北省分析科学技术重点实验室 [3]河北省疾病预防控制中心,河北石家庄050021

出　　处：《光谱学与光谱分析》2005年第5期792-795,共4页Spectroscopy and Spectral Analysis

基　　金：河北省教育厅基金项目(200114);河北省自然科学基金(203110)资助项目

摘　　要：采用单阀双阳离子交换树脂微柱并联,设计了双柱交替采样逆向洗脱在线富集系统,该系统与原子吸收测量技术相结合,实现了在线富集火焰原子吸收光谱法测定水中镉,富集1min时,分析速度为60样/h,测定镉的特征浓度为0.931μg·L-1,线性范围分别为0～90μg·L-1,相对标准偏差分别为2.69%、检出限(3σ)为0.808μg·L-1该法对实际水样加标回收率在95.0%～103.7%之间。A rapid and sensitive methed for the determination of trace cadmium in environment water samples based on flow injection on-line preconcentration on two-microcolumn system-flame atomic absorption spectrometry has been developed. The cadmium in samples was sequentially retained on two microcolumns with cation exchange resin and was eluted directly in the nebulizer by 1.5 mol center dot L-1 HCl solution. The characteristic concentration (preconcentration time 1 min) for cadmium was 0.931 mu g center dot L-1. The relative standard deviation at the 5 mu g center dot L-1 level was 2.69% and the corresponding detection limit (3 sigma) was 0.808 mu g center dot L-1. The method has been successfully applied to the determination of cadmium in water reference material GBW08608 and other water samples.

关 键 词：火焰原子吸收光谱 在线富集 流动注射 镉 

分 类 号：O657.3[理学—分析化学]