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Photodegradation of Imidacloprid and Fipronil in Rice–Paddy Water

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Abstract

Photodegradation of insecticides, imidacloprid and fipronil, in rice–paddy water under the ambient temperature was investigated. The initial concentrations were set at 58.8 and 3.1 μg/L for imidacloprid and fipronil, respectively, according to their reported initial concentrations in the rice–paddy field. The half-lives (DT50) of imidacloprid and fipronil were 24.2 and 36.7 h, respectively. Fipronil desulfinyl was detected as a major metabolite and fipronil sulfone was found to be a minor metabolite of fipronil in the photodegradation process. Detected mass of fipronil, fipronil desulfinyl, and fipronil sulfone at 79 h were 12.9%, 45.8%, and 5.2% of initial fipronil mass, respectively.

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Acknowledgments

This work was supported in part by the Heiwa Nakajima Scholarship Foundation and a Grant-in-Aid for Biological Studies on Wildlife under the Framework ExTEND2005 in Japan.

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Correspondence to Hirozumi Watanabe or Kazuhiro Takagi.

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Thuyet, D.Q., Watanabe, H., Yamazaki, K. et al. Photodegradation of Imidacloprid and Fipronil in Rice–Paddy Water. Bull Environ Contam Toxicol 86, 548–553 (2011). https://doi.org/10.1007/s00128-011-0243-x

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  • DOI: https://doi.org/10.1007/s00128-011-0243-x

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