A simple voltammetric procedure for speciation and evaluation of As removal from water |
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Authors: | Maria do Socorro S Pereira Eduardo Winter Jose Roberto Guimarães Susanne Rath Anne Hélène Fostier |
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Institution: | (1) Instituto de Química, Universidade Estadual de Campinas (Unicamp), P.O. Box 6154, 13084-971 Campinas, SP, Brazil;(2) Faculdade de Engenharia Civil, Arquitetura e Urbanismo, Universidade Estadual de Campinas (Unicamp), P.O. Box 6021, 13084-871 Campinas, SP, Brazil |
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Abstract: | Here, we show a fast and sensitive method for the determination of inorganic arsenic in natural waters using differential
pulse cathodic stripping voltammetry. All the arsenite determinations were done in 2.0 mol L−1 HCl + 3.15 × 10−4 mol L−1 Cu(II) supporting electrolyte. 1 × 10−3 mol L−1 sodium thiosulphate was used as As(V) reducing agent. The detection limit was 0.5 μg L−1 for both species. The method has been applied to water samples collected in an arsenic-contaminated region of Brazil, in
particular, to verify the efficiency of the solar oxidation and removal of arsenic process applied to these waters. |
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Keywords: | Arsenic Water Speciation Voltammetry SORAS |
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