dc.contributor.author |
Rey Castro, Carlos |
dc.contributor.author |
Mongin, Sandrine |
dc.contributor.author |
Huidobro Redondo, César |
dc.contributor.author |
David, Calin |
dc.contributor.author |
Salvador, José |
dc.contributor.author |
Garcés, Josep Lluís |
dc.contributor.author |
Galceran i Nogués, Josep |
dc.contributor.author |
Mas i Pujadas, Francesc |
dc.contributor.author |
Puy Llorens, Jaume |
dc.date |
2016-12-12T11:33:58Z |
dc.date |
2009 |
dc.date |
10000-01-01 |
dc.identifier |
0013-936X |
dc.identifier |
http://hdl.handle.net/10459.1/58798 |
dc.identifier |
https://doi.org/10.1021/es803006p |
dc.identifier.uri |
http://hdl.handle.net/10459.1/58798 |
dc.description |
The effective distribution of affinities (Conditional Affinity
Spectrum, CAS) seen by ametal ion bindingto 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 acidfor14 different cationsinthe presence ofmajorinorganic
ions and trace metals at pH and concentration values
representative of a river water. The distribution of occupied
sites andtheir average affinity atthetypicalfreshwater conditions
are also reported for each ion. The CAS allows us to 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
affinityfor carboxylic sites, in contrastto 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. |
dc.description |
We gratefully acknowledge support of this research by the Spanish Ministry of Education and Science (Projects CTQ2006-14385 and CTM2006-13583) and from the “Comissionat d’Universitats i Recerca de la Generalitat de Catalunya”. S. Mongin was supported by an FPI-MEC grant from the Spanish Government. |
dc.language |
eng |
dc.publisher |
American Chemical Society |
dc.relation |
MIECI/PN2004-2007/CTQ2006-14385 |
dc.relation |
MIECI/PN2004-2007/CTM2006-13583 |
dc.relation |
Reproducció del document publicat a https://doi.org/10.1021/es803006p |
dc.relation |
Environmental Science and Technology, 2009, vol. 43, núm. 19, p. 7184-7191 |
dc.rights |
(c) American Chemical Society, 2009 |
dc.rights |
info:eu-repo/semantics/restrictedAccess |
dc.title |
Effective affinity distribution for the binding of metal Ions to a generic fulvic acid in natural waters |
dc.type |
article |
dc.type |
publishedVersion |