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 431299
Title Gel-water partitioning of soil humics in diffusive gradient in thin film (DGT) analysis of their metal complexes
Author(s) Veeken, P.L.R. van der; Leeuwen, H.P. van
Source Environmental Chemistry 9 (2012)1. - ISSN 1448-2517 - p. 24 - 30.
Department(s) Physical Chemistry and Colloid Science
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) dynamic speciation analysis - donnan membrane technique - natural organic-matter - in-situ - model predictions - proton-binding - trace-metals - ion binding - acid - hydrogels
Abstract Metal complexes of humic and fulvic acids are ubiquitous in aqueous environmental media. In metal speciation analysis by DGT (diffusive gradient in thin film) with polyacrylamide hydrogels, soil humic acid species have been shown to significantly accumulate in the diffusive gel layer. As a result, the speciation of their metal complexes inside the gel is changed with respect to that in the sample medium. In low ionic strength samples, the effects of sorption of the charged humic species are compounded by Donnan partitioning. Here we lay out the basic features that govern the partition of humic species between gel and water, and discuss their effect on the properties of the DGT metal flux.
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