The fate of acephate and carbaryl in water

Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
S SzetoR F Shepherd

Abstract

Acephate was resistent to hydrolysis in distilled, buffered water at pH 4.0 to 6.9, but not at pH 8.2, held for 20 days at 20 or 30 degrees C. The maximum conversion to methamidophos was 4.5% of the added acephate at pH 8.2 and 20 degrees C. The persistence of acephate in two natural waters, held at 9 degrees C for up to 42 and 50 days varied: 80% were recovered from pond water after 42 days, and 45% from creek water after 50 days. Rates of acephate degradation increased greatly when treated water samples were incubated in the presence of sediments, but not if water and sediment were autoclaved prior to treatment and incubation. The greatest conversion to methamidophos, 1.3% of the added acephate, had occurred after 42 days in pond water without sediment. Under the same conditions, carbaryl was less persistent than acephate in the natural waters: 18 to 20% were recovered from pond water after 42 days, and 37 to 40% from creek water after 50 days. The presence of sediment did not affect its degradation significantly. But more than 55% were recovered after 50 days if water and sediment were autoclaved prior to treatment and incubation. Neither acephate, methamidophos, nor carbaryl could be shown to escape from water into the atmo...Continue Reading

References

Sep 1, 1972·Canadian Journal of Microbiology·P C OloffsS Szeto
May 1, 1973·Bulletin of Environmental Contamination and Toxicology·R D Wauchope, R Haque

Citations

Jan 1, 1990·Bulletin of Environmental Contamination and Toxicology·T S DikshithP K Ray
Jan 1, 1981·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·K M Sundaram, S Szeto
Jan 1, 1981·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·G H GeenB A McKeown
Aug 1, 1984·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·A C ChukwudebeP C Oloffs

Related Concepts

Bionomics
Hydrogen-Ion Concentration
Insecticides
Organothiophosphorus Compounds
Carbaryl, Nickel (2+) Salt
Landfill Leachate

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