Catalytic Adsorptive Stripping Voltammetry of Cobalt in the Presence of Dimethylglyoxime and Nitrite at In Situ Plated Lead–Copper Film Electrode

Abstract

AbstractA lead‐copper film electrode was proposed for Co(II) determination by catalytic adsorptive stripping voltammetry. The electrode was plated in situ and hence the exchange of a solution after plating step was not required. At optimized conditions the calibration graph for Co(II) was linear from 5×10−10 to 2×10−8 mol L−1 for accumulation time of 15 s. The relative standard deviation for Co(II) determination at concentration 5×10−9 mol L−1 was 4.1%. The detection limits for Co(II) were 1.2×10−10 and 1.0×10−11 mol L−1 for an accumulation time of 15 and 180 s, respectively. The method was applied to Co(II) determination in certified reference material and other water samples.