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Assessing the contamination risk of five pesticides in a phreatic aquifer based on microcosm experiments and transport modelling at Sint-Jansteen (Zeeland, the Netherlands)

Published online by Cambridge University Press:  01 April 2016

I. Gaus  and
K. Vande Casteele
I. Gaus*
Affiliation:
Laboratory for Applied Geology and Hydrogeology, University of Ghent (Belgium)
K. Vande Casteele
Affiliation:
Laboratory for Applied Geology and Hydrogeology, University of Ghent (Belgium)
*
Corresponding author, now at BRGM (French Geological Survey), 3 Avenue Claude Guillemin, BP6009, 45060 Orléans Cedex 2, France; e-mail:[email protected]

Abstract

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The risk of five pesticides (atrazine, simazine, bentazone, mecoprop and MCPA) contaminating a Quaternary phreatic aquifer (the water supply area of Sint-Jansteen, the Netherlands) is assessed based on laboratory experiments and solute transport modelling (MODFLOW-MT3D). Batch experiments either show long half-lives (at least 1500 days) or no degradation at all for bentazone, atrazine and simazine while mecoprop and especially MCPA degrade much faster (half-lives down to 4.1 days). Column experiments show significant sorption to the aquifer sediment only for atrazine and simazine under certain circumstances. A series of experiments were conducted during which the type of the sediment, the grain size, the content of the organic matter and the acidity of the groundwater were varied. These experimental results were subsequently incorporated in a solute transport model for the aquifer resulting in the following ranking of the contamination risk for the selected pesticides (from low to high): MCPA, mecoprop, simazine, atrazine, bentazone. This ranking was confirmed by observed pesticide concentrations in samples taken from piezometers and extraction wells from the aquifer.

Keywords

pesticidestransport modellingaquifercolumn experimentsmicrocosm experimentsZeeland
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 83 , Issue 2 , June 2004 , pp. 101 - 112
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2004

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