Weijnen PHC ,
Linskens WMA ,
Snijders A ,
Linden AMA van der
47 p
in Dutch
1990
Toon Nederlands
English Abstract 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injected 7 m below surface and withdrawn again 1.5 m downstreams.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.
