Carbonate and bicarbonate trace metal complexes: Critical reevaluation of stability constants.

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Abstract
The anions HCO3- and CO32- could play a major complexing role for trace metals in CO2 rich thermomineral water. A complete thermochemical data set concerning the aqueous complexes of some divalent metal complexes (Fe, Mn, Ni, Co, Cu, Pb, Zn, Cd) with the ligands HCO3- and CO32- is given. When not previously determined experimentally, stability constants and enthalpies of formation of the complexes were estimated at 25.degree. C from empirical correlations or theoretical approaches. The distribution of the trace metal species in typical water samples [Massif Central, France] is given, indicating that the importance of complexes with bicarbonate cannot be neglected in that type of water.

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