Polarographic waves of tri-n-butyl phosphate and polarographic determination of uranium in the presence of tri-n-butyl phosphate

Abstract

The results of a study on the polarographic behaviour of TBP and its influence on the determination of uranyl ions is presented. The half-wave potential of the adsorption wave of TBP depends on the concentration of TBP, type of supporting elec trolyte and its concentration. In the presence of TBP the polarographic wave of U(VI) ion is changed. Below 7·10⁻⁵ M TBP the polarographic wave of U(VI) is not affected, between 7·10⁻⁵ and 2·10⁻⁴ M TBP the shape, height and half-wave potential of U(VI) waves are changed and above 2·10⁻⁴ M, up to saturated solution of TBP, the waves of U(VI) do, not change further. The bes supporting electrolytes for the determination of U(VI) are KNO₃ or NaClO₄ in concentrations of 0.1 to 0.5 M, pH 1–2 and TBP concentrations from 3·10⁻⁴ to 1.2·10⁻³ M.