Simultaneous determination of nickel and cadmium by adsorptive stripping voltammetry

Abstract

A sensitive and fast method for the simultaneous determination of trace amounts of nickel and cadmium in real samples has been described using differential pulse adsorptive stripping voltammetry (DPASV) by adsorptive accumulation of the N,N′-bis(salicylaldehydo)4-carboxyphenylenediamine (BSCPDA) - complex on the hanging mercury drop electrode (HMDE). As supporting electrolyte 0.02 mol L-1 ammonia buffers containing ligand has been used. Optimal analytical conditions were found to be: BSCPD A concentration of 42 μM, pH 9.6 and adsorption potential at -50 mV versus Ag/AgCl. With an accumulation time of 20 s, the peaks current are proportional to the concentration of nickel and cadmium over the 1-180, and 0.5-200 ng mL -1 with detection limits of 0.06 and 0.03 ng mL-1 respectively. The sensitivity of method for determination of nickel and cadmium were obtained 0.54 and 0.98 nA mL ng-1, respectively. The procedure was applied to simultaneous determination of nickel and cadmium in some real and synthetic artificial samples with satisfactory results. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.