Electrochemical generation of arsenic volatile species using a gold/mercury amalgam cathode. Determination of arsenic by atomic absorption spectrometry
Abstract:
The electrochemical generation of arsenic volatile species (arsine) using an Au/Hg amalgam cathode in a 0.5M 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 0.027μgL-1 (3σ) detection limit for As(III) in aqueous solutions and a 2.4% relative standard deviation for a 0.1μgL-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.
Año de publicación:
2015
Keywords:
- Electrochemical arsenic hydride generation
- Tap water samples
- Atomic absorption spectrometry
- Arsine
Fuente:
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Tipo de documento:
Article
Estado:
Acceso abierto
Áreas de conocimiento:
- Química analítica
- Electroquímica
Áreas temáticas:
- Química analítica