Research article summary (published 29 Sep 2009):

Effective affinity distribution for the binding of metal ions to a generic fulvic acid in natural waters.

Full Abstract

The effective distribution of affinities (Conditional Affinity Spectrum, CAS) seen by a metal ion binding to a humic substance under natural water conditions is derived and discussed within the NICA-Donnan model. Analytical expressions for the average affinity of these distributions in general multi-ion mixtures are reported here for the first time. These expressions enable a simple evaluation of the effect of all interfering cations on the affinity distribution of a given one. We illustrate this methodology by plotting the affinity spectra of a generic fulvic acid for 14 different cations in the presence of major inorganic ions and trace metals at pH and concentration values representative of a river water. The distribution of occupied sites and their average affinity at the typical freshwater conditions are also reported for each ion. The CAS allows usto distinguish three groups of cations: (a) Al, H, Pb, Hg, and Cr, which are preferentially bound to the phenolic sites of the fulvic ligand; (b) Ca, Mg, Cd, Fe(II), and Mn, which display a greater effective affinity for carboxylic sites, in contrast to what would be expected from their individual complexation parameters; and (c) Fe(III), Cu, Zn, and Ni, for which phenolic and carboxylic distributions are overlapped.

Author information

Author/s: Rey-Castro, Carlos (C); Mongin, Sandrine (S); Huidobro, César (C); David, Calin (C); Salvador, José (J); Garcés, Josep Lluís (JL); Galceran, Josep (J); Mas, Francesc (F); Puy, Jaume (J);

Affiliation: Departament de Química, Universitat de Lleida, Rovira Roure 191, 25198 Lleida, Spain.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Environmental science & technology (Environ Sci Technol), published in United States. (Language: eng)

Reference: 2009-Oct; vol 43 (issue 19) : pp 7184-91

Dates: Created 2009/10/23; Completed 2009/11/10;

PMID: 19848120, status: MEDLINE (last retrieved date: 11/10/2009)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MeSH Headings (categories) shown below.

Benzopyrans - chemistry Ecology - methods Ecosystem Environmental Monitoring Hydrogen Bonding

Hydrogen Bonding Ions Metals - chemistry Rivers Water - chemistry

Note: Bold headings indicate primary MeSH headings or qualifiers.

Associated Chemicals: Benzopyrans (0) ; Ions (0) ; Metals (0) ; fulvic acid (479-66-3) ; Water (7732-18-5)

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