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Photochemical behavior of fenpropathrin and λ-cyhalothrin in solution

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Abstract

The photodegradation processes of fenpropathrin and λ-cyhalothrin were studied in hexane, methanol/water (1:1, v/v), and acetone in both ultraviolet light and simulated sunlight. Intermediates in the photodegradation process were identified using gas chromatography/mass spectrometry (GC/MS), and the analysis of intermediates was used to speculate on possible photodegradation pathways. The photodegradation processes of fenpropathrin and λ-cyhalothrin followed pseudo first-order kinetics. The photodegradation rates varied according to the solvent in decreasing order: hexane > methanol/water (1:1, v/v) > acetone. The effects of substances coexisting in the environment on the photodegradation of pyrethroids were also investigated in the research. Acetone, humic acid, and riboflavin increased photodegradation rates while l-ascorbic acid slowed the process. This study provides a theoretical basis for the removal of pyrethroid pollution from the natural environment.

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Acknowledgments

This work was supported by grants from National Natural Science Foundation of China (21377033) and the Education Department of Hebei. We also thank the anonymous reviewers of the manuscript for their helpful comments.

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Correspondence to P. Y. Liu.

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Responsible editor: Philippe Garrigues

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Liu, P.Y., Li, B., Liu, H.D. et al. Photochemical behavior of fenpropathrin and λ-cyhalothrin in solution. Environ Sci Pollut Res 21, 1993–2001 (2014). https://doi.org/10.1007/s11356-013-2119-6

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Keywords

  • Fenpropathrin
  • λ-Cyhalothrin
  • Photodegradation
  • Degradation mechanism
  • GC-μECD
  • GC/MS