Cyclic voltammetric study of arsenic reduction and oxidation in hydrochloric acid using a Pt RDE

Wei, Z.; Somasundaran, P.
February 2004
Journal of Applied Electrochemistry;Feb2004, Vol. 34 Issue 2, p241
Academic Journal
The redox reactions of arsenic species in hydrochloric acid was studied by CV with a Pt RDE at different potential scan rates and electrode rotation speeds. Distinct current peaks associated with redox reactions between arsenite and elemental arsenic were observed, while no peak related to the oxidation of arsenite to arsenate or the reduction of elemental arsenic to arsine was observed. The redox reactions between arsenite and elemental arsenic were determined to be irreversible and were shown to involve complex reaction mechanisms. The observation of elemental arsenic reduction on Pt in aqueous solutions suggests that the removal of arsenic by zero-valent iron possibly involves the reduction of arsenite; the absence of redox peaks between arsenite and arsenate indicates that it is difficult to control the speciation between As(III) and As(V) electrochemically.


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