Polarographic Studies on Selenite Ions in Aqueous Hypophosphorous Acid Solutions

Abstract

The polarographic behaviour and determination of Se(IV) in hypophosphorous acid solutions of concentrations varying from 0.05 mol l-1 to 4.0 mol l-1 at 25 ± 0.1 °C were investigated. It was shown that the reduction of 5 . 10-4 mol l-1 Se(IV) at the DME takes place in two waves independent on the acid concentration. The reduction waves correspond to the transfer of 6 electrons. A mechanism of the reduction at the DME has been suggested. A method for the analytical determination of Se(IV) species in 0.1 mol l-1 and 0.05 mol l-1 hypophosphorous acid in absence and in presence of 3 . 10-6 mol l-1 Cd(II) and Zn(II) was developed using a differential pulse technique.