Electroanalysis of the binding and adsorption of Hg2+ with seleno aminoacids by differential pulse and elimination voltammetry at the Au-disk electrode

The complexation of Se-aminoacids selenomethionine (SeMet) and selenocystine (SeCyst) with Hg2+ was investigated by differential pulsed voltammetry (DPV) on Au-disk electrode. Complexation processes are proposed from the Gaussian Peak Adjustment analysis of DPV titration data. Main complexes were both 1:1 Hg:SeMet and Hg:SeCyst, although the formation of 2:1 complexes can be also proposed for Hg:SeCyst. Elimination voltammetry with linear scan was applied to investigate the adsorption of the ligands and the complexes on the Au surface.