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Title:
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Evaluation of the performance and limitations of empirical partition-relations and process based multisurface models to predict trace element solubility in soils
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Author(s):
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Comans, R.N.J.; Groenenberg, B.J.; Dijkstra, J.J.; Bonten, L.T.C.; Vries, W. de
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Published by:
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Publication date:
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ECN
Environment & Energy Engineering
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24-7-2012
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ECN report number:
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Document type:
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ECN-V--12-015
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Article
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Number of pages:
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Full text:
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11
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Download PDF
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Published in: Environmental Pollution (Elsevier), , januari 2012, Vol.volume 166, p.98-107.
Abstract:
Here we evaluate the performance and limitations of two frequently used model-types to predict trace
element solubility in soils: regression based “partition-relations” and thermodynamically based “multisurface
models”, for a large set of elements. For this purpose partition-relations were derived for As, Ba, Cd,
Co, Cr, Cu, Mo, Ni, Pb, Sb, Se, V, Zn. The multi-surface model included aqueous speciation, mineral equilibria,
sorption to organic matter, Fe/Al-(hydr)oxides and clay. Both approaches were evaluated by their
application to independent data for a wide variety of conditions. We conclude that Freundlich-based
partition-relations are robust predictors for most cations and can be used for independent soils, but
within the environmental conditions of the data used for their derivation. The multisurface model is
shown to be able to successfully predict solution concentrations over a wide range of conditions. Predicted
trends for oxy-anions agree well for both approaches but with larger (random) deviations than for cations
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