Photodegradation of cis-configuration neonicotinoid cycloxaprid in water
DENG Ya-yun1, ZHUANG Ying-ying1, FENG Yue1, LU Si-yuan1, CHENG Jia-gao1, XU Xiao-yong1,2
1. Shanghai Key Lab of Chemistry Biology, Institute of Pesticides and Pharmaceuticals, East China University of Science and Technology, Shanghai 200237, China;
2. Shanghai Collaborative Innovation Center for Biomanufacturing Technology, Shanghai 200237, China
In order to correctly evaluate the environmental risk of the new insecticide CYC, the influence of the CYC initial concentration, temperature, initial pH, concentration of hydrogen peroxide and nitrate on the CYC photodegradation in water were studied. The results show that the photodegradation of cycloxaprid was fitted to pseudo-first-order kinetics reaction. For direct photodegradation, cycloxaprid photolysis rate was accelerated with the decreasing of CYC concentration and the increase of temperature. The activation energy of photochemical reaction was 21.27kJ/mol. By measuring the CYC pKa value of 3.42 and simulation CYC reactivity of different forms of light particles, known the complicated influence of pH value on CYC photolysis:In the acidic conditions, the degradation rate of cycloxaprid depended on the different cycloxaprid forms(cations and neutral particles) and their singlet energy values. While, in the alkaline condition, the photodegradation rate was mainly affected by the number of hydroxyl radicals in the solution. For CYC indirect photodegradation, nitrate and hydrogen peroxide were confirmed to promote the role. When evaluating the environmental risk of CYC should comprehensively consider the effect of environmental factors on its degradation.
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