title: The degradation of chlorpyrifos and diazinon in aqueous solution by ultrasonic irradiation: effect of parameters and degradation pathway.
abstract: In this paper, elimination of two types of organophosphorus pesticides (OPPs), chlorpyrifos and diazinon spiked in aqueous solution by ultrasonic irradiation was investigated. Results showed that chlorpyrifos and diazinon could be effectively and rapidly degraded by ultrasonic irradiation, and the degradation of both pesticides was strongly influenced by ultrasonic power, temperature and pH value. Furthermore, two and seven products for the degradation of chlorpyrifos and diazinon formed during ultrasonic irradiation have been identified by gas chromatography-mass spectrometry, respectively. The hydrolysis, oxidation, hydroxylation, dehydration and decarboxylation were deduced to contribute to the degradation reaction and the degradation pathway for each pesticide under ultrasonic irradiation was proposed. Finally, the toxicity evaluation indicated that the toxicity decreased for diazinon solution after ultrasonic irradiation, but it increased for chlorpyrifos solution. The detoxification of OPPs by ultrasonic irradiation was discriminative.
authors.affiliation: College of Food Science & Nutritional Engineering, Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Engineering Research Centre for Fruits and Vegetables Processing, Ministry of Education, China Agricultural University, Beijing 100083, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yaxi
authors.initials: Y
authors.lastname: Hou
authors.forename: Fang
authors.initials: F
authors.lastname: Chen
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Xiao
authors.forename: Jianing
authors.initials: J
authors.lastname: Zhang
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Hu
mesh_terms: D004390:Chlorpyrifos / Q000737:chemistry* / Q000633:toxicity; D003976:Diazinon / Q000737:chemistry* / Q000633:toxicity; D008401:Gas Chromatography-Mass Spectrometry; D019220:High-Energy Shock Waves; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000737:chemistry* / Q000633:toxicity; D014733:Vibrio / Q000187:drug effects; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000633:toxicity; D018508:Water Purification / Q000379:methods*
chemical_list: D007306:Insecticides; D014874:Water Pollutants, Chemical; D004390:Chlorpyrifos; D003976:Diazinon