Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 496032
Title Effect of dissolved organic matter composition on metal speciation in soil solutions
Author(s) Ren, Zong Ling; Tella, Marie; Bravin, M.N.; Comans, R.N.J.; Dai, Jun; Garnier, Jean Marie; Sivry, Yann; Doelsch, Emmanuel; Straathof, Angela; Benedetti, M.F.
Source Chemical Geology 398 (2015). - ISSN 0009-2541 - p. 61 - 69.
DOI http://dx.doi.org/10.1016/j.chemgeo.2015.01.020
Department(s) Chair Soil Chemistry and Chemical Soil Quality
WIMEK
Chair Soil Biology and Biological Soil Quality
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) Composition - Dissolved organic matter - Metal speciation - NICA-Donnan modeling - SC-DMT
Abstract

Knowledge of the speciation of heavy metals and the role of dissolved organic matter (DOM) in soil solution is a key to understand metal mobility and ecotoxicity. In this study, soil column-Donnan membrane technique (SC-DMT) was used to measure metal speciation of Cd, Cu, Ni, Pb, and Zn in eighteen soil solutions, covering a wide range of metal sources and concentrations. DOM in these soil solutions was also fractionated into humic acid (HA), fulvic acid (FA), hydrophilic acid (Hy), and hydrophobic neutral organic matter (HON) by a rapid batch technique using DAX-8 resin. Our results show that in soil solution Pb and Cu are dominant in complex form, whereas Cd, Ni and Zn mainly exist as free ions; for the whole range of soil solutions, only 26.2% of DOM is humic substances and consists mainly of fulvic acid (FA). The metal speciation measured by SC-DMT was compared to the predicted ones obtained via the NICA-Donnan model using the measured FA concentrations. The free ion concentrations predicted by speciation modeling were in good agreement with the SC-DMT measurement. Moreover, we show that to make accurate modeling of metal speciation in soil solutions, the knowledge of DOM composition, especially FA fraction, is the crucial information, especially for Cu and Cd; like in previous studies the modeling of Pb speciation is not optimal and an update of Pb generic binding parameters is required to reduce model prediction uncertainties.

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