title: Photochemical behavior of fenpropathrin and λ-cyhalothrin in solution.
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.
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China. hbupyliu@163.com.
authors.forename: P Y
authors.initials: PY
authors.lastname: Liu
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China.
authors.forename: B
authors.initials: B
authors.lastname: Li
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China.
authors.forename: H D
authors.initials: HD
authors.lastname: Liu
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China.
authors.forename: L
authors.initials: L
authors.lastname: Tian
mesh_terms: D001205:Ascorbic Acid / Q000378:metabolism; D008401:Gas Chromatography-Mass Spectrometry; D006812:Humic Substances; D007700:Kinetics; D009570:Nitriles / Q000032:analysis / Q000737:chemistry; D055668:Photochemical Processes; D010777:Photochemistry / Q000379:methods; D010782:Photolysis; D011722:Pyrethrins / Q000032:analysis / Q000737:chemistry*; D013472:Sunlight; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D009570:Nitriles; D011722:Pyrethrins; D014874:Water Pollutants, Chemical; C044267:fenpropathrin; D001205:Ascorbic Acid; C037304:cyhalothrin
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