Abstract
By eliminating the interfering effect of the oxygen reduction with the aid of a microcomputer, the voltammetric determination of trace uranyl ions after preconcentration on the TOPO-coated glassy carbon electrode was possible in the presence of dissolved oxygen. A voltammogram for the reduction of dissolved oxygen was obtained just before the preconcentration of uranyl ions. It was subtracted from the voltammogram measured after the preconcentration, in which the reduction wave for the concentrated uranyl ions and that for dissolved oxygen were overlapped. The resulting voltammogram was then differentiated, and the peak current for the derivative curve was measured. For the determination of uranium, a standard addition method was employed. The method could be applied to sea water samples by only adjusting their pH to 4.0.
