Stability (formation) constants of metal-ion complexes with inorganic and organic ligands in aqueous solution are employed widely for modelling chemical speciation in areas as diverse as medicine, engineering, process control, extractive metallurgy, environmental management and so on. The available data are both extensive and widely dispersed across the scientific literature, which creates difficulties for potential users of such data. Fortunately, there has been a long-standing tradition of serious attempts at compiling stability constant and related thermodynamic data, starting with the efforts of Sill�n and Martell for the UK Chemical Society and more recently in the form of electronic data bases. Unfortunately, most of these compilations do not attempt to distinguish reported results according to their reliability, that is, they are not �critical�. This is a major disadvantage for the non-expert user of such data. This situation was recognised a long time ago by key researchers in the field who set up a group within IUPAC in the 1970s to oversee production of critical evaluations of stability constant and related thermodynamic data. Having gone through a number of transformations, this work continues as part of the activities of the IUPAC Sub-Committee on Solubility and Equilibrium data.  This talk will provide an overview of the many contributions that have been made by the IUPAC group to this important task.

Critical evaluation of stability constant data by IUPAC

248th National Meeting (2014)

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