DETERMINATION OF PALLADIUM BY ADSORPTIVE STRIPPING VOLTAMMETRY

Adsorptive accumulation of the Pd(II) complex with dimethylglyoxime wa s evaluated for stripping voltammetry with respect to different parame ters. The sensitivity of the method and the linearity between the peak current and the concentration of Pd(II) depends on the ionic strength , the electrode area, the preconcentration time, the transport rate to the electrode, and the potential scan rate. The most appropriate medi um was 0.1 mol/L acetate buffer between pH 3.5 and 4. Using 2 min of p reconcentration at a 2.6 mm(2) electrode and the differential pulse mo de, a detection limit of 0.05 mu g/L Pd was achieved for liquid sample s and 50 ng/g for solid samples. Different aqueous and solid samples w ere analysed and the recovery from biological and inorganic materials investigated.