在线富集-导数火焰原子吸收光谱法测定环境水样中镉  

Determination of cadmium in environmental water samples by on-line preconcentration-derivative flame atomic absorption spectrometry

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

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

出　　处：《冶金分析》2004年第6期9-12,共4页Metallurgical Analysis

基　　金：河北省教育厅基金项目 (No .2 0 0 114 );河北省自然科学基金 (No .2 0 3 110 )资助课题

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 -导数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 0 80 μg/L ,线性范围为 0～ 10 μg/L ,相对标准偏差为 3 .45 % ,检出限为 0 .10 7μg/L。该法对实际水样加标回收率在92 0 %～ 10 6A rapid and sensitive method for the determination of trace cadmium in environmental water samples has been developed, based on flow injection on-line preconcentration on two-microcolumn system coupled with flame atomic absorption spectrometry with derivative signal processing. The cadmium in samples were sequentially retained on two microcolumn with cation exchange resin and was directly eluted into nebulizer by 1.5 mol/L HCl solution.The characteristic concentration(preconcentration time 1 min) for cadmium was 0.080 μg/L.The relative standard deviation at the 1.0 μg/L level was 3.45% and corresponding detection limit (3σ) was 0.107 μg/L.The method has been successfully applied for the determination of cadmium in water certified reference material GBW08608 and other water samples.

关 键 词：在线富集 双柱 微柱 相对标准偏差 原子吸收 逆向 检出限 环境水样 加标回收率 洗脱 

分 类 号：O657.31[理学—分析化学]