ADSORPTIVE STRIPPING VOLTAMMETRY OF PALLADIUM(II) WITH THIORIDAZINE IN-SITU MODIFIED CARBON-PASTE ELECTRODES

A method is described for the voltammetric determination of palladium( n) using a carbon paste electrode modified with thioridazine. The modi fier was added to the analyte solution and adsorbed onto the electrode surface under closed circuit conditions. Palladium could be preconcen trated onto the electrode surface and determined by differential pulse voltammetry without medium exchange. The dependence between the curre nt response and the concentration of palladium(II) was linear within a range of 1 to 450 mu g L(-1) with preconcentration times between 0 an d 120 seconds. The influence of parameters such as modifier concentrat ion and pH-value on the determination of palladium were investigated. The applicability of this method for the voltammetric determination of palladium in fresh water and in catalysts used for synthetic organic reactions is demonstrated.