Abstract
Flooded post-harvest rice paddies were examined as systems for reducing diazinon (organophosphate insecticide) concentrations in stormwater runoff. Two paddies were cultivated in Oryza sativa L. and amended with a 3-h simulated stormwater diazinon runoff event. Initial diazinon adsorption peaked at 347 and 571 μg kg−1 (3% mass load reduction) for mean above-ground plant tissue concentrations in each pond, respectively. Subsequent senescence of above-ground tissue showed significant decreases in tissue mass (r 2 = 0.985) and adsorbed diazinon mass (90 ± 4% and 82 ± 1%) within 1 month of amendment. There were no corollary increases in water column diazinon concentrations. Furthermore, control O. sativa tissue placed within the treatment ponds had below-detectable levels of diazinon throughout the decomposition phase, suggesting a lack of within pond transference of dissipated diazinon. This study shows the relative effectiveness of diazinon adsorption by post-harvest rice plants and a potential mitigation strategy of senescence and pesticide degradation for contaminated tailwater.
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Acknowledgments
Financial support was gratefully received through the cooperative agreement between the USDA-ARS and the University of Mississippi, No. 58-6408-1-095. Thanks go to the staff of the Water Quality and Ecology Research Unit at the USDA-ARS (Sam Testa, Charlie Bryant, Tim Sullivan, Calvin Vick, John Massey, and Terry Welch) for field help and especially to Lisa Brooks and Sammie Smith Jr. for sample preparation and analyses.
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Kröger, R., Moore, M.T., Cooper, C.M. et al. Diazinon Accumulation and Dissipation in Oryza sativa L. Following Simulated Agricultural Runoff Amendment in Flooded Rice Paddies. Water Air Soil Pollut 201, 209–218 (2009). https://doi.org/10.1007/s11270-008-9938-y
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DOI: https://doi.org/10.1007/s11270-008-9938-y