A simple voltammetric procedure for speciation and evaluation of As removal from water

摘要

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.