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- W2079427209 abstract "This paper describes the analysis and rates of hydrolysis of the monoalkyl carbamate insecticides Sevin and Baygon, and the dialkyl carbamates Pyrolan and Dimetilan in aqueous media. The rates of hydrolysis with different hydroxylion concentrations were measured. Second order rate constants for Sevin, Baygon, Pyrolan and Dimetilan at 20°C were found to be 2.04 x 102, 3.04 x 10, 7.0 x 10−1 and 3.4 x 10−3 1. mol−1 min−1, respectively, indicating that the dialkyl carbamates were more stable to alkaline hydrolysis than the monoalkyl carbamates. The rates of hydrolysis at different pH values, ranging from 4.0 to 10.0, were also studied. All the compounds were stable to hydrolysis within the acidic pH range. However, measurable hydrolysis was observed at pH 7.0 and 8.0 for sevin and baygon, respectively, and the rates of hydrolysis increased with the rise of the pH value. At pH 8.0 about 99 per cent of sevin was hydrolyzed in 9 days while baygon reached the same level of hydrolysis after 107 days. Pyrolan and Dimetilan, on the other hand, were stable towards hydrolysis within the investigated pH range. The effect of temperature on the rates of hydrolysis was also investigated. This study shows that the persistence of the carbamate pesticides in natural waters is greatly influenced by the pH value and temperature of the aquatic environment." @default.
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- W2079427209 date "1971-12-01" @default.
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- W2079427209 title "Studies on the persistence of some carbamate insecticides in the aquatic environment—I. Hydrolysis of sevin, baygon, pyrolan and dimetilan in waters" @default.
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- W2079427209 doi "https://doi.org/10.1016/0043-1354(71)90084-4" @default.
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