The influence of lipophilicity and formulation on the distribution of pesticides in laboratory-scale sediment/water systems

A - Papers appearing in refereed journals

Bromilow, R. H., Evans, A. A. and Nicholls, P. H. 2003. The influence of lipophilicity and formulation on the distribution of pesticides in laboratory-scale sediment/water systems. Pest Management Science. 59 (2), pp. 238-244.

AuthorsBromilow, R. H., Evans, A. A. and Nicholls, P. H.
Abstract

Pesticide reaching surface waters will be sorbed by sediment. This sorption process and the influence of pesticide formulation have been examined at 10degreesC in small-scale systems having 2-cm depth of sediment and 8-cm overlying water stirred gently. Eight pesticides (triasulfuron, isoproturon, chlorotoluron, phenmedipham, difenoconazole, chlorpyrifos, pendimethalin and permethrin), spanning a range of physicochemical properties, were applied individually to the water. Sorption equilibrium was reached at between 15 and 30 days, the proportion of pesticide then in the sediment ranging from 20% for the acidic and therefore polar triasulfuron to 97% for the lipophilic permethrin; this behaviour was not influenced by formulation. Sorption coefficients measured in batch tests over 2h gave good estimates of the equilibrium distribution. Some degradation was observed for all compounds over 90 days; for some compounds and formulations, enhanced degradation occurred after 20 to 60 days. It is concluded that lipophilicity is the chief determinant of pesticide distribution in sediment/water systems.

KeywordsAgronomy; Entomology
Year of Publication2003
JournalPest Management Science
Journal citation59 (2), pp. 238-244
Digital Object Identifier (DOI)doi:10.1002/ps.540
PubMed ID12587878
Open accessPublished as non-open access
FunderPesticides Safety Directorate (MAFF)
Funder project or code439
514
Project: 054142
Output statusPublished
Publication dates
Online07 Jan 2003
Publication process dates
Accepted01 May 2002
Copyright licensePublisher copyright
PublisherWiley
ISSN1526-498X

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