饮用水中无机砷形态分析  

Speciation analysis of inorganic arsenic in drinking water

作　　者：李勋[1] 朱业晋[1] 薛珺[1] 

机构地区：[1]赣南师范学院化学与生命科学学院,赣州341000

出　　处：《中国地方病学杂志》2008年第1期101-103,共3页Chinese Jouranl of Endemiology

基　　金：江西省教育厅科学技术研究项目（赣教技字[2007]298）

摘　　要：目的建立电化学氢化物发生与原子吸收光谱联用技术对无机砷形态分析的方法．为地方性砷中毒病区饮用水中砷的形态分析提供快速的检测方法。方法基于3价砷（iAsⅢ）和5价砷（iAsⅤ）电化学氢化物发生效率的差异，实现低电流条件下对iAsⅢ的选择性还原和测定；在高电流条件下实现iAsⅢ和iAsv的电化学氢化，并根据吸收加和性原理测定iAsⅤ。结果以0.4、1．2A为优化的电解电流条件，iAsⅢ和iAsⅤ测定的检出限分别为03、0．6μg/L。本方法应用于饮用水中无机砷的形态分析，样品加标回收率为96％（14．4／15．0）～102％（10．2／10．0）。结论该方法灵敏、准确可靠，操作简单、快速，适用于地方性砷中毒病区饮用水中不同形态砷的测定分析。Objective To develop a new procedure for the speciation analysis of inorganic arsenic in drinking water in endemic arsenism areas using atomic absorption spectrometry coupled with electrochemical hydride generation. Methods Inorganic arsenic species was determined based on the fact that iAsⅢ showed a significantly higher absorbance at low electrolytic currents than iAsⅤ. The concentration of iAsv could be calculated according to the absorbance additivity obtained at high electrolytic current. Results Under the electrolytic currents of 0.4 and 1.2 A, the methodology developed provided the detection limits of 0.3 and 0.6 μg/L for iAsⅢ and iAsⅤ, respectively. The method was successfully applied to speciation analysis of inorganic arsenic in drinking water, with the recovery of 96%（14.4/15.0） - 102%（10.2/10.0）. Conclusions This approach is an easy and fast method with sensitivity and accuracy for speciation analysis of inorganic arsenic in drinking water in endemic arsenism areas.

关 键 词：原子吸收光谱 砷 水 形态 

分 类 号：R686[医药卫生—骨科学]