Chemical speciation of environmentally significant heavy metals with inorganic ligands part 1: The Hg2+- Cl-, OH-, CO32-, so42-, and PO 43- aqueous systems

K.J. Powell; P.L. Brown; R.H. Byrne; T. Gajda; G. Hefter; S. Sjoberg; H. Wanner

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Chemical speciation of environmentally significant heavy metals with inorganic ligands part 1: The Hg2+- Cl-, OH-, CO32-, so42-, and PO 43- aqueous systems

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Chemical speciation of environmentally significant heavy metals with inorganic ligands part 1: The Hg2+- Cl-, OH-, CO32-, so42-, and PO 43- aqueous systems

K.J. Powell, P.L. Brown, R.H. Byrne, T. Gajda, G. Hefter, S. Sjoberg and H. Wanner

Pure and Applied Chemistry, Vol.77(4), pp.739-800

2005

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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 -, CO32-, SO42-, and PO43-. 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 CO32- and PO43-. 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).

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Title: Chemical speciation of environmentally significant heavy metals with inorganic ligands part 1: The Hg2+- Cl-, OH-, CO32-, so42-, and PO 43- aqueous systems
Authors/Creators: K.J. Powell (Author/Creator)
P.L. Brown (Author/Creator)
R.H. Byrne (Author/Creator)
T. Gajda (Author/Creator)
G. Hefter (Author/Creator)
S. Sjoberg (Author/Creator)
H. Wanner (Author/Creator)
Publication Details: Pure and Applied Chemistry, Vol.77(4), pp.739-800
Publisher: International Union of Pure and Applied Chemistry
Identifiers: 991005540198107891
Murdoch Affiliation: School of Chemical and Mathematical Science
Language: English
Resource Type: Journal article

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