Determination of Se(IV) as a 5-nitropiazselenol complex by adsorptive stripping voltammetry at an in situ plated bismuth film electrode

In this paper a simple, selective, sensitive and reproducible stripping method based on adsorption of Se(IV) in the form of a 5-nitropiazoselenol complex at the surface of an in situ plated bismuth film electrode was introduced. All affecting parameters on adsorption, stripping and complex formation steps were evaluated and studied. Under optimum conditions the established calibration curve obeyed the linear regression equation in the range of 2 to 50 μg L⁻¹ of Se(IV) concentrations. The estimated detection and quantification limits were 0.05 and 0.15 μg L⁻¹ of Se(IV), respectively. In addition, the mean and RSD for determination of 5 μg L⁻¹ of Se(IV) were calculated to be 4.91 and 2.8% (n = 5). The accuracy of the method was certified by comparison of the results obtained from the proposed method and those obtained from ICP-OES as the reference method.