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Solution chemistry
Suggested set of 'best' equilibrium constants for Ta binding by l.m.w. ligands to be published (hopefully) soon (paper already submitted).
The only published critical compilation of Ta equilibrium constants is the one by S.A. Wood, The aqueous geochemistry of zirconium, hafnium, niobium and tantalum. In: Linnen RL and Samson IM (eds.) Rare Element Geochemistry and Mineral Deposits.Geological Association of Canada Short Course Notes, vol. 17, pp. 217–268.
The non-critical IUPAC compilation of stability constants (SC-Database) is no longer available. You will find these Ta data at: tantalum.txt