Voltammetric determination of mercury(ii) in hemodialysis polyelectrolyte solutions using Bi–glassy carbon electrodes modified with l-cysteine

Abstract

A new method for direct determination of Hg(II) in high-salt (HS) polyelectrolyte solutions used for hemodialysis is discussed. Determination was made by anodic stripping voltammetry with a glassy carbon working electrode modified with bismuth and L-cysteine. Acetate buffer was used as the supporting electrolyte. The detection (LOD) and quantification (LOQ) limits for Hg(II) were 0.02 and 0.07 μg L⁻¹, respectively. Recoveries from spiked samples lay between 103.3 and 108.3%. The method was used to quantify Hg(II) directly in HS commercial samples without sample pretreatment. Interferences and the Cys–Bi–GC electrode preparation were discussed.