Evaluating acute toxicity of methyl parathion application in constructed wetland mesocosms

Environmental Toxicology
C D MilamS Smith

Abstract

Wetland ecosystems have reduced ambient levels of various organic and metallic compounds, although their effectiveness on agricultural pesticides is not well documented. Five stations within each of two 10 x 50 m constructed wetlands (two vegetated, two nonvegetated) were selected to measure the fate and effects of methyl parathion (MeP). Following a simulated storm event (0.64 cm of rainfall), aqueous, sediment, and plant samples were collected and analyzed spatially (5, 10, 20, and 40 m from the inlet) and temporally (after 3-10 days) for MeP concentrations and for the impact of those concentrations on the aquatic fauna. Aqueous toxicity to fish decreased spatially and temporally in the vegetated mesocosm. Pimephales promelas survival was significantly reduced, to 68%, at the 10-m station of the nonvegetated wetlands (3 h postapplication), with pesticide concentrations averaging 9.6 microg MeP/L. Ceriodaphnia in both the vegetated and nonvegetated wetlands was sensitive (i.e., a significant acute response to MeP occurred) to pesticide concentrations through 10 days postapplication. Mean MeP concentrations in water ranged from 0.5 to 15.4 microg/L and from 0.1 to 27.0 microg/L in the vegetated and nonvegetated wetlands, respec...Continue Reading

References

Apr 1, 1997·Ecotoxicology and Environmental Safety·W B HawkinsM L Cano
Apr 2, 2002·Chemosphere·M T MooreJ H Rodgers

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Citations

Jun 6, 2007·Archives of Environmental Contamination and Toxicology·J L BouldinC M Cooper
Jun 11, 2011·Bulletin of Environmental Contamination and Toxicology·Juan Carlos Arias-Almeida, Roberto Rico-Martínez
Sep 8, 2009·Ecotoxicology and Environmental Safety·Rachel Dosnon-OlettePhilippe Eullaffroy
Nov 30, 2005·Environmental Pollution·M T MooreR Schulz
Dec 3, 2014·Environment International·Jan Vymazal, Tereza Březinová

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