Analytical Chemistry Research

Abstract:

24 The electrochemical generation of arsenic volatile species (arsine) using an Au/Hg amalgam cathode in a 25 0.5 MH2so4 solution, is described. Results were compared with those obtained with other cathodes com-26 monly used for generation of arsine. The effects of the electrolytic conditions and interferent ions have 27 been studied. Results show that the Au/Hg cathode has better tolerance to interference and higher 28 repeatability than cathodes made out of platinum (Pt), gold (Au), reticulated glassy carbon (RGC), lead 29 (Pb). Under optimized conditions, a 0.027 lg LÀ1 (3r) detection limit for As (III) in aqueous solutions 30 and a 2.4% relative standard deviation for a 0.1 lg LÀ1 As (III) were obtained. The accuracy of the method 31 was verified by determination of As in a certified reference material. The proposed method was applied to 32 the determination of As in spiked tap water samples. 33© 2015 Published by Elsevier BV This is an open access article under the CC BY-NC-ND license (http://34 creativecommons. org/licenses/by-nc-nd/4.0/).

Año de publicación:

2015

Keywords:

Fuente:

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