DIFFERENTIAL-PULSE CATHODIC STRIPPING VOLTAMMETRY OF THE COPPER-COMPLEXES OF GLYCYL-L-HISTIDYL-GLYCINE AT A HANGING MERCURY DROP ELECTRODE
Articles > Article · 1993
Authors: Fatma Nil ERTAŞ, AG FOGG, JC MOREIRA, J BAREK
TALANTA, Journal Indexed in SCI Expanded, International, 1993, vol 40, pp 1481-1488
DOI: 10.1016/0039-9140(93)80357-w
Summary
The behaviour of the copper complexes of glycyl-L-histidyl-glycine (GHG) was investigated using cyclic voltammetry and differential pulse voltammetry after their adsorptive accumulation on the surface of a hanging mercury drop electrode (HMDE). The nature of the observed cathodic and anodic peaks was established and optimum conditions were found for the differential pulse cathodic stripping voltammetric determination of GHG at the 1 x 10(-8)M concentration level using adsorptive accumulation at -0.20 V vs. Ag/AgCl reference electrode and the cathodic stripping peak around -0.4 V (pH 8.3). This peak corresponds to the reduction of the Cu(I)-GHG complex formed at the HMDE surface as an intermediate in the reduction of Cu(II)-GHG to Cu(O)amalgam.