drop amalgam voltammetric study of lead complexation by natural inorganic ligands in a salt lake
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ID: 251505
2004
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Abstract
A study of inorganic complexation of lead using drop amalgam voltammetry is described. The study has been carried out in simulated salt lake water and at ionic strength of 7.35 M, the predetermined ionic strength of Lake Katwe. The complexation of lead with the simple ligands (Cl-, CO32-) created anodic waves and the shifts of the peak potentials of lead with the introduction of varying concentrations of each ligand measured. The analysis of these shifts furnished information about the stability constants of the lead complexes which was employed in the calculation of lead species distribution. These mathematical treatments revealed the existence of two lead chloride complexes with corresponding stability constants log β1 = 0.88, log β2 = 2.95; and two carbonate complexes with log β1 = 8.50 and log β2 = 9.62. The results obtained indicate that in Lake Katwe water (25 oC, carbonate alkalinity = 0.11 M, pH 11) approximately 0.00% of total inorganic lead exists as the free ion, and at chloride concentration of 1.8 M only 1.3% of lead exists as the free ion.
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| Authors | ;Muhammad Ntale;Jude T. Nyangababo;Knut Schroeder |
| Journal | Experimental physiology |
| Year | 2004 |
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