氢化物发生原子荧光光谱法直接测定水样中砷(Ⅲ)和砷(Ⅴ)

Speciation of Arsenic(Ⅲ) and Arsenic(Ⅴ) in Water by Hydride Generation Atomic Fluorescence Spectrometry

建立了氢化物发生原子荧光光谱法直接测定水样中As（Ⅲ）和As（Ⅴ）的方法。无需任何预分离技术，通过直接调节氢化物发生反应的酸度而实现As（Ⅲ）和As（Ⅴ）的形态分离分析。研究了NaBH4、还原剂KI用量以及其他实验条件等对测定结果的影响，并进行了共存元素的干扰实验。结果表明，砷的检出限为0．026μg·L^-1相对标准偏差在2％左右，回收率为97．5％-103．0%，所建立的分析方法具有很强的适用性。

A method for arsenic（Ⅲ） and arsenic（ Ⅴ） speciation in water samples using HG-AFS was established. Without any preseparation technique, the speciation was simply accomplished by just adjustment of the acidity for hydride generation. For a sensitive, reproducible and accurate determination, other conditions for hydride generation, such as the concentration of NaBH4 and the added amount of KI as the reductant for arsenic（ Ⅴ）, were also optimized, and the interference experiment was carried out for concomitant elements. As a result, a detection limit of 0. 026 μg· L^-1 , a relative standard deviation of 2%, and a recovery of 97.5%-103.0% were obtained, indicating the robustness of the method.