液滴微萃取-石墨炉原子吸收光谱法测定环境水样中痕量镉  

Determination of trace cadmium in environmental water samples by graphite furnace atomic absorption spectrometry combined with droplet microextraction

作　　者：邵敏[1] 宋虎跃[1] 沈芳存[1] 邱海鸥[1] 汤志勇[1] 

机构地区：[1]中国地质大学材料科学与化学工程学院,湖北武汉430074

出　　处：《冶金分析》2011年第2期52-55,共4页Metallurgical Analysis

基　　金：中国地质调查局资助项目(2006010028)

摘　　要：以双硫腙-CCl4作为萃取体系,采用液滴微萃取方式分离富集镉,建立了以液滴微萃取富集石墨炉原子吸收光谱法测定了环境水样中痕量镉的分析方法。考察了不同萃取条件及仪器条件对测定的影响,并对各项实验条件进行优化。结果表明,方法的检出限为0.82×10-2ng/mL,线性范围为0.02~0.60 ng/mL,一般环境水体中的常见共存离子对测定没有影响。方法应用于实际水样中痕量镉的测定,结果与其他方法的测定值相吻合,加标回收率在95.6%~97.9%之间。By using dithizone-CCl4 solution as extraction system,a method of graphite furnace atomic absorption spectrometry combined with droplet microextraction was established for the determination of trace cadmium in environmental water samples.Different extraction and instrumental conditions were investigated.The experimental conditions were optimized.Results indicated that the limit of detection was 0.82×10-2 for cadmium.The linear range was 0.02-0.60 ng/mL.It was found that common ions in the environmental water had no influence on the results.The method was applied to determine trace cadmium in actual water samples.The results were consistent with those obtained by other methods,and a high recovery of 95.6 %-97.9 % was obtained.

关 键 词：液滴微萃取 石墨炉原子吸收光谱法 镉 双硫腙-四氯化碳 

分 类 号：O657.31[理学—分析化学]