Ertas F N, Fogg A G, Moreira J C, Barek J
Department of Chemistry, Loughborough University of Technology, Loughborough, Leicestershire LEII 3TU, U.K.
Talanta. 1993 Oct;40(10):1481-8. doi: 10.1016/0039-9140(93)80357-w.
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 detemination 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.
甘氨酰-L-组氨酰-甘氨酸（GHG）的铜配合物在悬汞滴电极（HMDE）表面发生吸附积累后，采用循环伏安法和差分脉冲伏安法对其行为进行了研究。确定了观察到的阴极和阳极峰的性质，并找到了在相对于Ag/AgCl参比电极-0.20 V下进行吸附积累，以及在pH 8.3时-0.4 V左右出现阴极溶出峰的最佳条件，用于差分脉冲阴极溶出伏安法在1×10⁻⁸M浓度水平下测定GHG。该峰对应于在HMDE表面形成的Cu(I)-GHG配合物的还原，它是Cu(II)-GHG还原为Cu(0)汞齐过程中的中间体。
