Pesticide residue has been paid global attention for its persistence in the environment and its toxicity to animals.1,2 Microbial degradation is considered as a main way to eliminate pesticides and possibly to be quantified since the development of compound-specific stable isotope analysis (CSIA).3,4 In this study, the microbial degradation potential of alpha-cypermethrin was studied in 15 different soils collected from agricultural field all over China based on CSIA. After an 80 days’ incubation, the carbon isotope ratios shifted from the initial δ13C value of -32.18‰ to the final δ13C value varying from -31.45‰ to -29.75‰, indicating a biodegradation rate of 33.29% to 73.85%. Meanwhile, a correlation analysis was performed by combining the biodegradation rate of alpha-cypermethrin with the chemical properties of the soils and revealed a strong positive correlation between the biodegradation rate of alpha-cypermethrin and the organic carbon content of the soils with a Pearson's correlation coefficient of 0.843. Our findings suggest that in-situ bioremediation of pesticide-contaminated soils can be improved by increasing the organic carbon content such as rational fertilization. References 1. Zhang AP, Liu WP, Yuan HJ, Zhou SS, Su YS, Li YF, Spatial distribution of hexachlorocyclohexanes in soils in Zhejiang Province, China and correlations with elevation and temperature. Environ. Sci. Technol. 2011, 45:6303-6308. 2. Wang LM, Liu WP, Yang CX, Pan ZY, Gan, JY, Xu C, Zhao MR, Schlenk D, Enantioselectivity in estrogenic potential and uptake of bifenthrin. Environ. Sci. Technol. 2007, 31:6124-6128. 3. Meyer AH, Penning H, Lowag H, Elsner M, Precise and accurate compound specific carbon and nitrogen isotope analysis of atrazine: Critical role of combustion oven conditions. Environ. Sci. Technol. 2008, 42:7757-7763. 4. Wu LP, Yao J, Trebse, Zhang N, Richnow HH, Compound specific isotope analysis of organophosphorus pesticides. Chemosphere 2014, 111:458-463.

Assessment of microbial degradation potential of alpha-cypermethrin in soil by compound-specific stable isotope analysis

251st National Meeting (2016)

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