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Study of the Photodegradation Kinetics and Pathways of Hexaflumuron in Liquid Media
Author(s) -
Lu Chengying,
Yin Xing,
Liu Xiaofeng,
Wang Minghua
Publication year - 2014
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12314
Subject(s) - photodegradation , chemistry , kinetics , methanol , nuclear chemistry , hydrogen peroxide , photochemistry , inorganic chemistry , organic chemistry , catalysis , physics , quantum mechanics , photocatalysis
Hexaflumuron, one of the benzoylphenylurea insect growth regulators, can be leached into surface water and thus having a potential impact on aquatic organisms. In this study, the photodegradation processes of hexaflumuron under high‐pressure mercury lamp irradiation were assessed. The photodegradation kinetics were studied, as were the effects of pH , different light sources, organic solvents and environmental substances, including nitrate ions (NO 3 − ), nitrite ions (NO 2 − ), ferrous ions (Fe 2+ ), ferric ions (Fe 3+ ), humic acid, sodium dodecyl sulfate (SDS) and hydrogen peroxide (H 2 O 2 ). Three photodegradation products in methanol were identified by gas chromatography‐mass spectrometry (GC‐MS). In general, the degradation of hexaflumuron followed first‐order kinetics. In the four media studied, the photodegradation rate order was n‐hexane > methanol > ultrapure water > acetone. Faster degradation was observed under high‐pressure mercury lamp irradiation than under xenon lamp irradiation. The pH had a considerable effect, with the most rapid degradation occurring at pH 5.0. The photodegradation rate of hexaflumuron was promoted in the presence of NO 3 − , NO 2 − , Fe 2+ , humic acid, SDS and H 2 O 2 , but inhibited by Fe 3+ . Moreover, the presumed photodegradation pathway was proposed to be the cleavage of the urea linkage.