Terrestrial environment

Photodegradation of new herbicide HW-02 in organic solvents


Zhongbin Lu , Zhiguang Hou , Xiumei Wang , Siwei Wang , Yanyan Shang , Xing Yuan

DOI:

Received December 10, 2009,Revised October 12, 2010, Accepted , Available online

Volume 22,2010,Pages 1774-1778

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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.

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