Abstract
Stability constants relevant to the inorganic speciation of lead in sea water are critically reviewed and a pH-dependent model for lead speciation is derived from selected constants. The model confirms the predominance of the PbCO3o species at pH 8 and introduces a mixed ligand complex, Pb (Cl, CO3)-, which is also important at this pH. A simple general relationship is derived between the thermodynamic activity of lead in sea water and the characteristics of added organic complexing agents (e.g. EDTA, NTA, citric acid and humic acid). The importance of considering competition between trace metal ions in such calculations is briefly discussed. The speciation model is used, in conjunction with a newly derived theory for plating at the rotating disc electrode, to define the electrochemical availability of lead in sea water and to estimate the electrochemical lability of individual complexes.
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