Chemical speciation of environmentally significant metals with inorganic ligands. PART 2: The Cu2+-OH-, Cl-, CO 32-, SO42-, and PO4 3- systems (IUPAC Technical Report)

Kipton J. Powell, Paul L. Brown, Robert H. Byrne, T. Gajda, Glenn Hefter, Staffan Sjöberg, Hans Wanner

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

Complex formation between CuII and the common environmental ligands Cl-, OH-, CO32-, SO 42-, and PO43- can have a significant effect on CuII speciation in natural waters with low concentrations of organic matter. Copper(II) complexes are labile, so the CuII distribution amongst these inorganic ligands can be estimated by numerical modeling if reliable values for the relevant stability (formation) constants are available. This paper provides a critical review of such 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 specific ion interaction coefficients required to calculate log10 βp,q,r values at higher ionic strengths. Some values for reaction enthalpies, ΔrHm, are also reported where available. In weakly acidic fresh water systems, in the absence of organic ligands, CuII speciation is dominated by the species Cu2+(aq), with CuSO 4(aq) as a minor species. In seawater, it is dominated by CuCO 3(aq), with Cu(OH)+, Cu2+(aq), CuCl +, Cu(CO3)OH-, Cu(OH)2(aq), and Cu(CO3)22- as minor species. In weakly acidic saline systems, it is dominated by Cu2+(aq) and CuCl+, with CuSO4(aq) and CuCl2(aq) as minor species.

Original languageEnglish
Pages (from-to)895-950
Number of pages56
JournalPure and Applied Chemistry
Volume79
Issue number5
DOIs
Publication statusPublished - May 2007

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Chemical speciation
Carbon Monoxide
Metals
Ligands
Water
Ionic strength
Seawater
Biological materials
Copper
Enthalpy
Thermodynamics
Ions
hydroxide ion

Keywords

  • Chemical speciation
  • Copper
  • Environmental
  • IUPAC Analytical Chemistry Division
  • Ligands
  • Stability constants

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Chemical speciation of environmentally significant metals with inorganic ligands. PART 2 : The Cu2+-OH-, Cl-, CO 32-, SO42-, and PO4 3- systems (IUPAC Technical Report). / Powell, Kipton J.; Brown, Paul L.; Byrne, Robert H.; Gajda, T.; Hefter, Glenn; Sjöberg, Staffan; Wanner, Hans.

In: Pure and Applied Chemistry, Vol. 79, No. 5, 05.2007, p. 895-950.

Research output: Contribution to journalArticle

Powell, Kipton J. ; Brown, Paul L. ; Byrne, Robert H. ; Gajda, T. ; Hefter, Glenn ; Sjöberg, Staffan ; Wanner, Hans. / Chemical speciation of environmentally significant metals with inorganic ligands. PART 2 : The Cu2+-OH-, Cl-, CO 32-, SO42-, and PO4 3- systems (IUPAC Technical Report). In: Pure and Applied Chemistry. 2007 ; Vol. 79, No. 5. pp. 895-950.
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