Determination of Se(iv) by adsorptive cathodic stripping voltammetry at a Bi/Hg film electrode

Abstract

Self-accumulation of Se(IV) on a new Bi/Hg film-coated electrode has been investigated by adsorptive cathodic stripping voltammetry. The parameters influencing the voltammetric response were evaluated and optimized in an open circuit system. The high adsorption tendency of Se(IV) on a Bi/Hg film-coated electrode has been addressed. The limits of detection and quantification under optimum conditions were 0.07 and 0.25 ng mL⁻¹, respectively, which are comparable with those of some other methods used for the determination of Se(IV). The mean, standard error and RSD for five replications of 5 ng mL⁻¹ of Se(IV) were calculated to be 4.94, 0.12 and 2.4%, respectively. This novel procedure was applied for the determination of selenium in vegetable, fruits and water samples. The results obtained through the proposed method were in good agreement with those of inductively coupled plasma-optical emission spectrometry (ICP-OES).