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Photodegradation of new herbicide HW-02 in organic solvents
Authors:Zhongbin Lu  Zhiguang Hou  Xiumei Wang  Siwei Wang  Yanyan Shang and Xing Yuan
Institution:1. College of Urban and Environmental Science, Northeast Normal University, Changchun 130024, China;College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, China
2. The Center for Measurement and Test, Jilin Agricultural University, Changchun 130118, China
3. Institute of Modernization, Jilin Agricultural University, Changchun 130118, China
4. College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, China
5. College of Urban and Environmental Science, Northeast Normal University, Changchun 130024, China
Abstract:HW-02 is a new organophosphates herbicide which is discovered and developed in China. The kinetics and mechanism of HW-02 photodegradation in the organic solvents were studied at 25°C under the irradiation of ultraviolet light. The results showed that photochemical reaction of HW-02 in organic solvents such as n-hexane, methanol, dimethyl benzene and acetone under UV light could be well described by the first kinetic equation, and the photodegradation efficiency decreased with a order of n-hexane > methanol > xylene > acetone. The photodegradation efficiency constant of HW-02 in n-hexane, methanol, xylene and acetone were 4.951 × 10?2, 3.253 × 10?2, 2.377 × 10?2 and 1.628 × 10?2 min?1, and the corresponding half-lives were 13.99, 21.20, 29.15 and 42.56 min, respectively. By separation and identification of photoproducts using GC-MS, it could be concluded that HW-02 was photolyzed through ester cleavage, photo-dechlorination and photoisomerization of the molecule itself.
Keywords:HW-02  organic solvent  photodegradation kinetics  degradation mechanism
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