Suitability of stripping chronopotentiometry for heavy metal speciation using hydrogen peroxide as oxidant: Application to the Cd(II)-EDTA-PMA system

摘要

The possibilities of stripping chronopotentiometry (SCP) for heavy metal speciation have been tested in the modality of chemical oxidation using the model systems Cd(II)-polyacrylic acid (PMA), Cd(II)-EDTA and Cd(II)-PMA-EDTA. The use of 0.03% H2O2 as a chemical oxidant provides reliable results from transition times, but peak potentials are dramatically affected by the presence of this reagent. The study suggests that chemical-oxidation SCP can be a technique complementary to other stripping modalities in the study of inert and macromolecular labile metal complexes.