Cathodic adsorptive stripping voltammetric determination of uranium with potassium hydrogen phthalate

The adsorption properties of dioxouranium (II)-Phathalate complexes onto ha nging mercury drop electrode are exploited in developing a highly sensitive and selective stripping voltammetric procedure for the determination of ur anium (VI). The reduction current of adsorbed complex ions of U(VI) was mea sured by both linear sweep (LSCSV) and differential pulse cathodic strippin g voltammetry (DPCSV), preceded by a period of preconcentration onto the el ectrode surface. As low as 2 x 10(-9) mol dm(-3) (0.5 mu g/l) and 2 x 10(-8 ) mol dm-3 (4.8 mu g/l) with accumulation time 240 and 120 s using DPCSV an d LSCSV, respectively, have been determined successfully. The relative stan dard deviation of 2.2% at the 5 ppm level was obtained. The interferences o f some metal ions and anions were studied. The application of this method w as tested in the determination of uranium in superphosphate fertilizer. (C) 1999 Elsevier Science B.V. All rights reserved.