Study of the Complexation of Pb(II) with meso-2,3-Dimercaptosuccinic Acid (DMSA) and 2,3-Dimercapto-1-propanesulfonic acid (DMPS) Using a Bismuth-Bulk Rotating Disk Electrode

摘要

For the first time, the suitability of bismuth bulk rotating disk electrode (BiB-RDE) for the study of metal complexation has been tested. Cyclic (CV) and differential pulse (DPV) voltammetry have been used to study the complexation of Pb(II) with two of the most effective chelating agents for the treatment of Pb(II) poisoning (meso-2,3-dimercaptosuccinic acid, DMSA, and 2,3-dimercapto-1-propanesulfonic acid, DMPS). Multivariate curve resolution has been applied to voltammetric data to obtain the stoichiometries and stability constants of the complexes formed. In both systems, the ML_2 complex was predominant, with log β_2 values of 10.13 and 8.80 for DMSA-Pb(II) and DMPS-Pb(II), respectively.