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An adsorptive stripping voltammetry procedure for ultra-trace determination of U(VI) using double accumulation step
Mieczyslaw Korolczuk1, Malgorzata Grabarczyk2, Iwona Rutyna2
1Faculty of Chemistry, Maria Curie-Sklodowska University, 20-031 Lublin, Poland..
Abstract:
We report a very sensitive stripping voltammetric procedure for determination of ultra-trace quantity of U(VI) in water samples. A very low detection limit was achieved owing to the application of a new construction of the voltammetric electrode cell with two built-in working electrodes that differed significantly in their surface area. The procedure was based on the double adsorptive accumulation of the U(VI)-cupferron complex onto two lead film working electrodes. Under optimal conditions the detection limit for accumulation time of 120 s for the big electrode and 120 s for the small electrode was about 3.1 × 10(-11) mol L(-1), whereas for accumulation time of 480 s for the big electrode and 240 s for the small electrode it was about 1.1 × 10(-11) mol L(-1). The proposed method was successfully validated using certified reference material seawater NASS-5.
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