Willem H van Riemsdijk

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A multisurface model is used to evaluate the contribution of various sorption surfaces to the control of heavy metal activity in sandy soil samples at pH 3.7-6.1 with different sorbent contents. This multisurface model considers soil as a set of independent sorption surfaces, i.e. organic matter (NICA-Donnan), clay silicate (Donnan), and iron hydroxides(More)
The complexation of heavy metals with dissolved organic matter (DOM) in the environment influences the solubility and mobility of these metals. In this paper, we measured the complexation of Cu, Cd, Zn, Ni, and Pb with DOM in the soil solution at pH 3.7-6.1 using a Donnan membrane technique. The results show that the DOM-complexed species is generally more(More)
R I C H A R D L O O K M A N , * , + D I R K F R E E S E , ' R O E L M E R C K X , + K A R E L V L A S S A K , + A N D W I L L E M H . V A N R I E M S D I J K S Laboratory of Soil Fertility and Soil Biology, K. U. Leuven, Kardinaal Mercierlaan 92, 3001 Heverlee, Belgium, Department of Soil Science, Humboldt University to Berlin, Invalidenstrasse 42, 101 15(More)
M A R C F . B E N E D E T T I , " , t , t CHRIS J . M I L N E , § D A V I D G . KINNIBURGH,S W I L L E M H . V A N R I E M S D I J K , * t t A N D LUUK K . K O O P A L " Department of Soil Science and Plant Nutrition and Department of Physical and Colloid Chemistry, Wageningen Agricultural University, Dreijenplein 10, 6703 HB Wageningen, The Netherlands,(More)
A total of 171 datasets of literature and experimental data for metal-ion binding by fulvic and humic acids have been digitized and re-analyzed using the NICA-Donnan model. Generic parameter values have been derived that can be used for modeling in the absence of specific metalion binding measurements. These values complement the previously derived generic(More)
The pH dependency of soluble phosphate in soil was measured for six agricultural soils over a pH range of 3-10. A mechanistic model, the LCD (ligand charge distribution) model, was used to simulate this change, which considers phosphate adsorption to metal (hydr)oxides in soils under the influence of natural organic matter (NOM) and polyvalent cations(More)
Dynamic metal speciation analysis in aquatic ecosystems is emerging as a powerful basis for development of predictions of bioavailability and reliable risk assessment strategies. A given speciation sensor is characterized by an effective time scale or kinetic window that defines the measurable metal species via their labilities. Here we review the current(More)
Most research dealing with soil (solution) speciation and metal uptake by plants has focused on the relationships between a certain bioavailable fraction in the soil and metal uptake by aboveground parts of the plants. Here, a new approach to interpretation of metal uptake is presented that considers four steps: First, the metal concentration in the soil(More)
The effect of pH on the bioaccumulation of nickel (Ni) by plants is opposite when using a nutrient solution or a soil as a growing medium. This paradox can be understood if the pH effect on the bioaccumulation, on the chemical speciation in the soil solution, and on the binding to the soil of Ni are all taken into account. Using simple equations to describe(More)
Quantitatively, little is known about the ion interaction processes that are responsible for the binding of phosphate in soil, water, and sediment, which determine the bioavailability and mobility of phosphate. Studies have shown that metal hydroxides are often responsible for the binding of PO4 in soils and sediments, but the binding behavior of PO4 in(More)