When we have two forms of As in an environment, how and in which potential does the reduction of As+3 to As0 occur, and the interference of As+5 form is zero?
Go thro' the attached article. It'll cater your need.
Good luck to you.
H3AsO3 + 3H+ + 3e- = As(s) + 3H2O E = 0.247
H3AsO4 + 2H+ + 2e- = H3AsO3 + H2O E = 0.575
It looks like the overpotential between the two processes above is not too bad however, ability to selectively reduce As 3+ may depend on the capabilities of your working electrode. I would suggest you prepare separate solutions of the metal in the two oxidation states and run a CV or another technique to see their reduction potentials at your WE. Then you can prepare a solution combining both forms and run the experiment again to check selectivity. You should be able to find an optimum potential for the reduction studies from these experiments.
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