Chemical speciation of environmentally significant heavy metals with inorganic ligands part 1

The Hg2+- Cl-, OH-, CO3 2-, so4 2-, and PO 4 3- aqueous 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

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Abstract

This document presents a critical evaluation of the equilibrium constants and reaction enthalpies for the complex formation reactions between aqueous Hg(II) and the common environmental inorganic ligands Cl-, OH -, CO3 2-, SO4 2-, and PO4 3-. The analysis used data from the IUPAC Stability Constants database, SC-Database, focusing particularly on values for 25°C and perchlorate media. Specific ion interaction theory (SIT) was applied to reliable data available for the ionic strength range Ic ≤ 3.0 mol dm-3. Recommended values of log10 β p,q,r° and the associated reaction enthalpies, Δ rHm°, valid at Im = 0 mol kg-1 and 25°C, were obtained by weighted linear regression using the SIT equations. Also reported are the equations and specific ion interaction coefficients required to calculate log10 βp,q,r values at higher ionic strengths and other temperatures. A similar analysis is reported for the reactions of H+ with CO3 2- and PO4 3-. Diagrams are presented to show the calculated distribution of Hg(II) amongst these inorganic ligands in model natural waters. Under typical environmental conditions, Hg(II) speciation is dominated by the formation of HgCl2(aq), Hg(OH)Cl(aq), and Hg(OH)2(aq).

Original languageEnglish
Pages (from-to)739-800
Number of pages62
JournalPure and Applied Chemistry
Volume77
Issue number4
DOIs
Publication statusPublished - Apr 2005

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Chemical speciation
Heavy Metals
Heavy metals
Ligands
Ions
Ionic strength
Enthalpy
Mercuric Chloride
Equilibrium constants
Linear regression
Water
hydroxide ion
Temperature

Keywords

  • Chemical speciation
  • Division V
  • Environmental
  • Heavy metals
  • Ligands
  • Stability constants

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Chemical speciation of environmentally significant heavy metals with inorganic ligands part 1 : The Hg2+- Cl-, OH-, CO3 2-, so4 2-, and PO 4 3- aqueous 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. 77, No. 4, 04.2005, p. 739-800.

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 heavy metals with inorganic ligands part 1 : The Hg2+- Cl-, OH-, CO3 2-, so4 2-, and PO 4 3- aqueous systems (IUPAC technical report). In: Pure and Applied Chemistry. 2005 ; Vol. 77, No. 4. pp. 739-800.
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