33 No. 4
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Kipton J. Powell, et al.
Pure and Applied Chemistry, 2011
Vol. 83, No. 5, pp. 1163–1214
The numerical modeling of CdII speciation amongst the environmental inorganic ligands Cl–, OH–, CO32–, SO42–, and PO43– requires reliable values for the relevant stability (formation) constants. This paper compiles and provides a critical review of these constants and related thermodynamic data. It recommends values of log10 βp,q,r° valid at Im = 0 mol kg–1 and 25 °C (298.15 K), along with the equations and empirical reaction ion interaction coefficients, ∆ε, required to calculate log10 βp,q,r° values at higher ionic strengths using the Brønsted–Guggenheim–Scatchard specific ion interaction theory. Values for the corresponding reaction enthalpies, ∆rH, are reported where available. Unfortunately, with the exception of the CdII-chlorido system and (at low ionic strengths) the CdII-sulfato system, the equilibrium reactions for the title systems are relatively poorly characterized.
This review is the fourth in a series relevant to the speciation of heavy metal ions in environmental waters of low to moderate ionic strength. It identifies the best available equilibrium data for use in chemical speciation modeling of reactions of Cd2+ with the major inorganic ligands present in environmental systems: Cl–, OH–, CO32–, SO42–, and PO43–. The previous reviews in this series were on the Hg2+, Cu2+, and Pb2+ complexation reactions with these ligands.
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