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Chemical speciation of environmentally significant heavy metals with inorganic ligands - Part 1: The Hg2+-Cl-, OH-, CO32-, SO42-, and PO43- aqueous systems - (IUPAC technical report)
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2005 (English)In: Pure and Applied Chemistry, ISSN 0033-4545, E-ISSN 1365-3075, Vol. 77, no 4, 739-800 p.Article in journal (Refereed) Published
Abstract [en]

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 I-c ≤ 3.0 mol dm(-3).

Recommended values of log(10) β(p,q,r)° and the associated reaction enthalpies, &UDelta;H-r(m)°, valid at I-m = 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 log(10) β(p,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).

Place, publisher, year, edition, pages
2005. Vol. 77, no 4, 739-800 p.
Keyword [en]
65 degrees c, carbonate solutions 25-degrees-c, mononuclear hydroxo complexes, acid dissociation-constants, sodium-chloride solutions, 3m kcl medium, phosphoric-acid, orthophosphoric acid, stability-constants, mercuric-chloride
URN: urn:nbn:se:umu:diva-13076DOI: doi:10.1351/pac200577040739OAI: diva2:152747
Available from: 2007-05-02 Created: 2007-05-02 Last updated: 2011-05-20Bibliographically approved

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Sjöberg, Staffan
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