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 391821
Title Effects of Lability of Metal Complex on Free Ion Measurement Using DMT
Author(s) Weng, L.P.; Riemsdijk, W.H. van; Temminghoff, E.J.M.
Source Environmental Science and Technology 44 (2010)7. - ISSN 0013-936X - p. 2529 - 2534.
Department(s) Soil Chemistry and Chemical Soil Quality
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) donnan membrane technique - soil solution - in-situ - dynamic speciation - trace-metals - copper - waters - dissociation - equilibrium - dialysis
Abstract Very low concentrations of free metal ion in natural samples can be measured using the Donnan membrane technique (DMT) based on ion transport kinetics. In this paper, the possible effects of slow dissociation of metal complexes on the interpretation of kinetic DMT are investigated both theoretically and experimentally. The expressions of the lability parameter, , were derived for DMT. Analysis of new experimental studies using synthetic solution containing NTA as the ligand and Cu2+ ions shows that when the ionic strength is low (=0.2 mM Ca(NO3)2) the dissociation rate of NTACu becomes the limiting step in Cu transport of the DMT measurement. In natural waters, dissolved organic matter (DOM) is the most important source of ligands that complex metals. By comparing the fraction of labile species measured using other dynamic sensors (DGT, GIME) in several freshwaters, it is concluded that in most waters ion transport in DMT is controlled by diffusion in the membrane. Only in very soft waters (
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