树脂预分离氢化物-原子荧光光谱法测定水中的As(Ⅲ)和As(Ⅴ)

Determination of As(Ⅲ) and As(Ⅴ) in water samples by hydride generation atomic fluorescence spectrometry with ion exchange technique

建立了As(Ⅲ)、As(V)的树脂分离 氢化物 原子荧光光谱分析方法。利用717阴离子交换树脂选择性的吸附水中的As(Ⅴ),从而实现了对水样中As(Ⅲ)和As(Ⅴ)的分离。考察了溶液的pH和流速以及洗脱剂浓度等条件对分离效果的影响,同时研究了仪器的工作条件、KBH4质量浓度和介质浓度对砷原子荧光强度的影响,并对测定砷时共存离子的干扰和消除进行了探讨。在最佳工作条件下,砷的检出限为0.096μg L,相对标准偏差为2.1%,将该方法应用于水样分析,其回收率为94.7%～107.9%。

A method was described for the separation and determination of arsenic species (arsenite, arsenate) by hydride generation-atomic fluorescence spectrometry(HG-AFS)combined with an ion exchange technique. The experimental conditions including pH value and the flow rate of solution, the concentration of stripping agent and the conditions that influenced the fluorescence intensity were investigated and optimized. Under optimum conditions the detection limit for arsenic was 0.096 μg/L and the relative standard deviation was 2.1%. The proposed method was applied to the determination of arsenite and arsenate in water samples with a recovery range of 94.7%～107.9%.