Cathodic stripping square-wave voltammetry for assessing As(III) removal with synthetic mixed oxides

ANGÉLICA C. HEREDIA; JENNY GÓMEZ AVILA; FERNANDO GARAY; MÓNICA E. CRIVELLO

JOURNAL OF SOLID STATE ELECTROCHEMISTRY (PRINT)

SPRINGER

Año: 2017

1432-8488

he possibility of counting with a reliable and economic system for filtering large volumes of water contaminated with arsenic is highly desired since different species of this element conform a major health risk through contamination of drinking and irrigation water supplies. In this work, the adsorption of As(III) species from aqueous solutions onto Mixed Oxides (MOs) synthesized from Layered Double Hydroxides (LDHs) has been assessed by cathodic stripping Square-wave voltammetry (CS-SWV). This electrochemical technique provides the fast, reliable, and systematic analysis required for studding the numerous aqueous samples. The optimized protocol consisted on the accumulation of arsenic for 60 s at ?0.4 V, in presence of 0.5 mM Cu(II), 0.3 µM pyrrolidine dithiocarbamate (PDTC), and 0.9 M HCl, followed by a reductive scan to ?1.0 V. A stable and well-defined peak was observed at ?0.780 V, with a linear range that goes from 2 µg L?1 to 110 µg L?1 of As(III). A value of limit of detectio