STUDY ON STRIPPING VOLTAMMETRY METHOD FOR ANALYSIS OF ORGANIC SELENIUM SPECIES DIMETHYLDISELENIDE

Abstract

This study is to apply differential pulse cathodic  stripping voltammetry with the use of hanging mercury drop electrode (HMDE) for speciation analysis of organic Selenium dimethyldiselenide (DMDSe). The reduction peak of dimethyldiselenide was obtained at -288 mV vs Ag/AgCl reference electrode in the 0.06 M HCl, 0.2 M LiClO₄/CH₂Cl₂+ C₂H₅OH electrolyte. Optimization of the analytical method  was conducted by manipulation of the voltammetric parameters (e.g. supporting electrolyte, deposition potential, deposition time, etc) to reach the conclusion that the detection limit ofdimethyl diselenide was 0.195 ppb at a deposition potential of -80 mV and for 90 seconds deposition.