Abstract
Differential pulse anodic stripping voltammetry (DPASV) has been employed to study the mixed ligand complexes of lead with carbonate, hydroxide, chloride and fluoride ligands. The single ligand complexes of lead with these ligands were studied initially. Several complexes, were obtained for each simple system: the hydroxo complexes PbOH+, Pb(OH)°, and Pb(OH)3° with mean stability constants of log β 1 = 0.301, log β 2 = 0.398 and log β = 2.462 respectively; carbonate complexes PbCO3° and Pb(CO3)2 2 with mean stability constants logß1 = 3.535 and log β 2 = 5.394; fluoro complexes PbF+ and PbF2° with stability constants of log β1 = 1.176 and log β2 = 3.00 respectively; chloro complexes PbCl+, PbCl2° and PbCl3 − with average stability constants of log β 1 = –0.301, log β2 = 0.398 and log β3 = 2.462 respectively. At 25°C in our 0.65 ionic strength, we obtained the following results with the mixed ligands systems:
Acknowledgements
The authors wish to acknowledge the financial and material support offered by Norwegian government, NUFU, which made these studies possible. We also thank Norah Nalubowa for typing the work.