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The speciation of cadmium(II) in ppb level by complexation with ethylenediamine (EN) has been inves- tigated by differential pulse anodic stripping voltammetry (DPASV) using thin mercury film coated glassy carbon electrode (TMFGCE). The overall work has been carried out at constant ionic strength of 0.01 mol dm -3 (NaNO 3 ) at ambient temperature. The pH was kept constant at 8.81 ± 0.10 by the addi- tion of borate buffer. The stability constants of different species of cadmium(II) with ethylenediamine have been calculated from the variation of peak potential and diffusion current of simple and complexed metal ions under the present experimental conditions. The logarithmic values of overall stability con- stants: log β 1 , log β 2 and log β 3 (β i = (CdL i )/(Cd 2+ )(L) i where i = 1, 2 and 3) have been found to be 5.01, 8.9 and 11.1 for CdL, CdL 2 and CdL 3 , respectively (charges were omitted for simplicity). The stability constants of cadmium complexes and hydrolysis constants of cadmium indicate that five different species of cadmium (Cd 2+ , CdOH + , CdL, CdL 2 and CdL 3 ) co-exist at ligand concentrations up to 5×10 - 4 mole dm -3 under the present experimental conditions. The results obtained by this method is applied to study the cadmium speciation in river water on the basis of competitive ligand exchange equilibri- um.

Electrochemical Studies on Speciation of Cadmium(II) in ppb Level by Complexation with Ethylenediamine in Aqueous Media