Chemical speciation of environmentally significant metals with inorganic ligands. Part 4: The Cd2+ + OH-, Cl-, co32-, So42-, and Po4 3- systems (IUPAC technical report)

Kipton J. Powell, Paul L. Brown, Robert H. Byrne, Tamas Gajda, Glenn Hefter, Ann Kathrin Leuz, Staffan Sjöberg, Hans Wanner

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The numerical modeling of CdII speciation amongst the environmental inorganic ligands Cl-, OH-, CO3 2-, SO4 2-, 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, Δε, required to calculate log10 βp,q,r values at higher ionic strengths using the Brønsted-Guggenheim-Scatchard specific ion interaction theory (SIT). Values for the corresponding reaction enthalpies, ΔrH, 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.

Original languageEnglish
Pages (from-to)1163-1214
Number of pages52
JournalPure and Applied Chemistry
Issue number5
Publication statusPublished - May 10 2011


ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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