Adsorptive Stripping Voltammetry for Determination of Cadmium in the presence of Cupferron on a Nafion-coated Bismuth Film Electrode

摘要

The method for reliable determination of Cd(II) by square wave adsorptive cathodic strippingvoltammetry was done. The technique involves an interfacial adsorption of Cd(II) as Cd-cupferroncomplex on a Nafion-coated bismuth film electrode and subsequent stripping from the electrode bysquare wave cathodic voltammetric and the reduction of Cd-cupferron complex. The optimumconditions of direct reduction of Cd(II) ions was observed by 0.1 M acetate buffer electrolyte (pH 4.0)-1 containing with 0.04 mM cupferron and 0.4 mg L Bi(III) of an accumulation potential at -300 mVversus Ag/AgCl and accumulation time 60 seconds. Under these optimum conditions, the linear-1 -1 concentration and detection limit (3 were found in the range of 3.0 to 40.0 L and 0.38 L ,-1 respectively. The relative standard deviation was 2.4% at the 5 g L (n=10). The procedure has beenapplied to the determination of Cd(II) in marine algae samples with satisfactory results.