Electrochemical generation of arsenic volatile species using a gold/mercury amalgam cathode. Determination of arsenic by atomic absorption spectrometry

Analytical Chemistry Research Pub Date : 2015-03-01 DOI:10.1016/j.ancr.2015.02.001

Andrea Caiminagua , Lenys Fernández , Hugo Romero , Byron Lapo , José Alvarado

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引用次数: 12

Abstract

The electrochemical generation of arsenic volatile species (arsine) using an Au/Hg amalgam cathode in a 0.5 M H₂SO₄ solution, is described. Results were compared with those obtained with other cathodes commonly used for generation of arsine. The effects of the electrolytic conditions and interferent ions have been studied. Results show that the Au/Hg cathode has better tolerance to interference and higher repeatability than cathodes made out of platinum (Pt), gold (Au), reticulated glassy carbon (RGC), lead (Pb). Under optimized conditions, a 0.027 μg L⁻¹ (3σ) detection limit for As(III) in aqueous solutions and a 2.4% relative standard deviation for a 0.1 μg L⁻¹ As(III) were obtained. The accuracy of the method was verified by determination of As in a certified reference material. The proposed method was applied to the determination of As in spiked tap water samples.

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利用金/汞汞合金阴极电化学生成砷挥发性物质。原子吸收光谱法测定砷

描述了在0.5 M H2SO4溶液中使用Au/Hg汞齐阴极电化学生成砷挥发性物质(砷)。结果与其他常用的生成砷的阴极进行了比较。研究了电解条件和干扰离子的影响。结果表明，与由铂(Pt)、金(Au)、网状玻碳(RGC)、铅(Pb)等材料制成的阴极相比，Au/Hg阴极具有更好的抗干扰性和重复性。在优化条件下，水溶液中As(III)的检出限为0.027 μg L−1 (3σ)，相对标准偏差为2.4% (0.1 μg L−1)。通过测定经认证的标准物质中的砷，验证了该方法的准确性。将该方法应用于自来水中砷的测定。

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Analytical Chemistry Research

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