Influences of aquatic plants on the fate of the pyrethroid insecticide Lambda-cyhalothrin in aquatic environments

Aquatic exposure assessments for pesticides are generally based on laboratory studies performed in water alone or water sediment systems. Although aquatic macrophytes, which include a variety of bryophytes, macroalgae, and angiosperms, can be a significant component of many aquatic ecosystems, their...

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Bibliographic Details
Published in:Environmental toxicology and chemistry 2001-08, Vol.20 (8), p.1740-1745
Main Authors: HAND, Laurence H, KUET, Sui F, LANE, Michael C. G, MAUND, Stephen J, WARINTON, Jacqui S, HILL, Ian R
Format: Article
Language:English
Subjects:
Adsorption
Biodegradation of pollutants
Biodegradation, Environmental
Biological and medical sciences
Biological Availability
Biotechnology
Environment and pollution
Fundamental and applied biological sciences. Psychology
Geologic Sediments - chemistry
Industrial applications and implications. Economical aspects
Insecticides - pharmacokinetics
Nitriles
Plants - chemistry
Pyrethrins - pharmacokinetics
Water Pollutants, Chemical - pharmacokinetics
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Summary:Aquatic exposure assessments for pesticides are generally based on laboratory studies performed in water alone or water sediment systems. Although aquatic macrophytes, which include a variety of bryophytes, macroalgae, and angiosperms, can be a significant component of many aquatic ecosystems, their impact on pesticide fate is generally not included in exposure assessments. To investigate the influence of aquatic plants on the fate and behavior of the pyrethroid insecticide lambda (lambda)-cyhalothrin, two laboratory experiments (to assess adsorption and degradation) and an indoor microcosm study (to assess fate under semirealistic conditions) were conducted. In the laboratory studies, adsorption to macrophytes was extensive and essentially irreversible, and degradation occurred rapidly by cleavage of the ester bond. In the indoor microcosm, which contained water, sediment, and macrophytes from a pond, degradation was also rapid, with DT50 and DT90 values of less than 3 and 19 h, respectively, for dissipation from the water column and of less than 3 and 56 h, respectively, for the whole system. For adsorptive and readily degraded pesticides like lambda-cyhalothrin, we conclude that macrophytes have considerable influence on fate and behavior in surface waters.
ISSN:0730-7268
1552-8618
DOI:10.1897/1551-5028(2001)020<1740:IOAPOT>2.0.CO;2