Determination of palladium(II) with α-(2-benzimidazolyl)-α′,α″-(N-5-nitro-2-pyridylhydrazone)-toluene by adsorptive cathodic stripping voltammetry

The determination of palladium(II) complexed with α-(2-benzimidazolyl)-α′,α″-(N-5-nitro-2-pyridylhydrazone)-Toluene (BINPHT) was investigated by adsorptive cathodic stripping voltammetry using hanging mercury drop electrode. Palladium(II) in the sample solution can be determined in BINPHT and ethylenediaminetetraacetic acid (EDTA). Accumulation is achieved by adsorption of Pd(II)–BINPHT complex on a hanging mercury drop electrode. Optimal conditions were found to be: supporting electrolyte; 0.01 M sodium acetate buffer at pH 5.0, accumulation potential; −590 mV versus Ag/AgCl, accumulation time; 180 s, scan rate; 50 mV s−1, concentration of BINPHT; 2×10−5 M. The linear range of Pd(II) was observed over the concentration range 20–100 ng ml−1 The detection limit (S/N=3) is 2 ng ml−1. A good reproductivity shows RSD of 2.0% (n=7). This procedure offers high selectivity with the presence of EDTA masking some metallic ions. River water sample spiking with palladium was determined.