Abstract
Fulvic acid exerts its influence only in the stripping step of chronopotentiometric stripping analysis (CPSA). Oxidation of reduced metal accumulated at a mercury-drop electrode is facilitated in the presence of fulvic acid, thus causing a reduction in the stripping time relative to that for a ligand-free solution, even when the same total amount of metal is oxidised. Data must be interpreted with caution; use of the term `labile' metal can be very misleading. CPSA is a potentially powerful tool to probe metal ion complexation over a wide range of ligand-to-metal ratios, allowing independent variation of both the total amount of metal oxidised and its rate of oxidation. The characteristic stripping peak parameters (stripping time, peak potential, and peak half-width) give information on the apparent stability and heterogeneity of the complexes formed by fulvic acid with copper(II) and lead(II).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
