Behaviour of pesticides in aquifer materials: In situ experiments
Weijnen PHC Linskens WMA Snijders A Linden AMA van der
Weijnen PHC
Linskens WMA
Snijders A
Linden AMA van der
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Series / Report no.
Open Access
Type
Report
Language
en
Date of publication
1990-05-31
Year of publication
Research Projects
Organizational Units
Journal Issue
Title
Behaviour of pesticides in aquifer materials: In
situ experiments
Translated Title
Gedrag van bestrijdingsmiddelen in de ondergrond:
In situ experimenten
Published in
Abstract
Abstract niet beschikbaar
In situ experiments using an injection/withdrawal system were done with five pesticides (atrazine, mecoprop, dinoseb, 1,3-dichloropropene and propachlor). Pesticides and a tracer (bromide) were injected 7 m below surface and withdrawn again 1.5 m downstreams. At the Bilthoven aquifer transformation of dichloropropene was found, the other pesticides (atrazine, dinoseb and propachlor) didn't interact with the aquifer material. At the Veendam aquifer dinoseb was completely retarded indicating degradation within two days. Dichloropropene was, as in Bilthoven, transformed and this is in agreement with laboratory research in which dichloropropene was hydrolysed. Atrazine was sorbed to the aquifer material and the partition coefficient was in the same order of magnitude as found in laboratory experiments. For propachlor retention was found. It was not clear, however, whether this retention was caused by sorption or by transformation or both. The Veendam aquifer is more reactive to pesticides than the Bilthoven aquifer and this is possibly caused by the difference in redox potential. The injection/withdrawal system is a good method to study the behaviour in aquifers.
In situ experiments using an injection/withdrawal system were done with five pesticides (atrazine, mecoprop, dinoseb, 1,3-dichloropropene and propachlor). Pesticides and a tracer (bromide) were injected 7 m below surface and withdrawn again 1.5 m downstreams. At the Bilthoven aquifer transformation of dichloropropene was found, the other pesticides (atrazine, dinoseb and propachlor) didn't interact with the aquifer material. At the Veendam aquifer dinoseb was completely retarded indicating degradation within two days. Dichloropropene was, as in Bilthoven, transformed and this is in agreement with laboratory research in which dichloropropene was hydrolysed. Atrazine was sorbed to the aquifer material and the partition coefficient was in the same order of magnitude as found in laboratory experiments. For propachlor retention was found. It was not clear, however, whether this retention was caused by sorption or by transformation or both. The Veendam aquifer is more reactive to pesticides than the Bilthoven aquifer and this is possibly caused by the difference in redox potential. The injection/withdrawal system is a good method to study the behaviour in aquifers.
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EG/DG12