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• W2083286169 abstract "The abiotic hydrolysis of the organophosphorus insecticide chlorpyrifos was examined in 37 different soils, which were chosen to represent a wide variety of physicochemical characteristics (e.g., pH 3.8−8.5). Samples of soil were sterilized via γ-irradiation, treated with [14C]chlorpyrifos at 10 μg/g, and incubated under standardized conditions (25 °C, field moisture capacity, darkness) for up to 4 months. Chlorpyrifos hydrolysis proceeded at a slow rate (<0.008 day-1) in acidic soils (pH ≤ 7). In alkaline soils, however, hydrolytic rate constants varied greatly (0.004−0.063 day-1). Corresponding hydrolytic half-lives for acidic and alkaline soils ranged from 92 to 341 and 11 to 200 days, respectively. Correlation analyses indicated that soil pH was the independent variable displaying the strongest association with hydrolytic rate constant (r = 0.55), but multiple regression models based on combinations of this parameter with other soil properties, including phosphatase enzyme activities, did not offer strongly predictive models for explaining the variability in kinetics observed (best fit r2 = 0.59). Incubation of chlorpyrifos with both sterile and nonsterile soils revealed that although both microbial and hydrolytic mechanisms contributed to chlorpyrifos degradation in all soils, there were clearly soils in which hydrolysis constituted the major route of degradation. Chlorpyrifos hydrolysis was greatly accelerated under low moisture conditions, both in acidic and alkaline soils. Additional experiments in several soils that displayed rapid chlorpyrifos hydrolysis at 10 μg/g provided evidence that the hydrolytic reaction was inhibited at higher concentration (1000 μg/g). Results highlight the importance but also the complex nature of the hydrolytic breakdown of chlorpyrifos in soil. Under certain conditions (e.g., some alkaline soils, air-dry soils) hydrolysis may be the driving factor modulating chlorpyrifos persistence. Keywords: Chlorpyrifos; soil; hydrolysis; degradation" @default.
• W2083286169 created "2016-06-24" @default.
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• W2083286169 date "1996-01-01" @default.
• W2083286169 modified "2023-09-25" @default.
• W2083286169 title "Factors Affecting the Hydrolytic Degradation of Chlorpyrifos in Soil" @default.
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• W2083286169 doi "https://doi.org/10.1021/jf9506141" @default.
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