APPLICATION OF DPASV TO THE STUDY OF HEAVY-METAL COMPLEXATION IN COLLOIDAL LATEX DISPERSIONS

Differential pulse anodic stripping voltammetry (DPASV) was applied to the study of the binding of Zn-II, Cd-II and Pb-II by two kinds of po lystyrene latex particles at different pH values and at different elec trolyte concentrations. For the calculation of stability constants, th e criterion of consistency between current and potential data was appl ied. For Cd-II and Pb-II, the application of DPASV yields qualitativel y good results (in agreement with those previously found by DPP). Howe ver, from a quantitative point of view, the consistency criterion ofte n reduces the applicability of the technique to quite narrow pH ranges , which increases the error in some calculations. In the case of Zn-II certain anomalies were found, rendering quantitative considerations i mpossible.