INDIRECT DETERMINATION OF URANIUM TRACES BY ADSORPTIVE STRIPPING VOLTAMMETRY WITH ARSENAZO-III

Trace concentrations of uranium were determined indirectly using adsor ptive stripping voltammetry with Arsenate III. The current response wa s characterized with respect to pH, concentration of the reagent in a supporting electrolyte, accumulation time and accumulation potential. Optimum conditions included a supporting electrolyte of 0.1 M KCL + HC l (pH 1.8) containing Arsenate III (5.7 x 10(-7) mol/L), an accumulati on potential of 0 V (vs. SCE), and a scan range from -0.4 V to 0 V usi ng a hanging mercury drop electrode. With an accumulation period of 12 0 s, a detection limit of 1 x 10(-8) mol/L of uranium was obtained. Th e proposed method was applied for the determination of uranium traces in water and soil samples.