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| Photodegradation of Pyraclostrobin in Water Environment and Microencapsulation Effect on Its Photostability |
| Received:February 13, 2015 |
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| KeyWord:pyraclostrobin;water environment;photodegradation;half-life;microencapsulation |
| Author Name | Affiliation | E-mail | | GUAN Lei | College of Plant Protection, Shandong Agricultural University, Key Laboratory of Pesticide Toxicology and Application Technique, Tai'an 271018, China | | | ZHANG Peng | College of Plant Protection, Shandong Agricultural University, Key Laboratory of Pesticide Toxicology and Application Technique, Tai'an 271018, China | | | WANG Xiao-kun | College of Plant Protection, Shandong Agricultural University, Key Laboratory of Pesticide Toxicology and Application Technique, Tai'an 271018, China | | | REN Yu-peng | College of Plant Protection, Shandong Agricultural University, Key Laboratory of Pesticide Toxicology and Application Technique, Tai'an 271018, China | | | GUO Bei-bei | College of Plant Protection, Shandong Agricultural University, Key Laboratory of Pesticide Toxicology and Application Technique, Tai'an 271018, China | | | LIU Feng | College of Plant Protection, Shandong Agricultural University, Key Laboratory of Pesticide Toxicology and Application Technique, Tai'an 271018, China | fliu@sdau.edu.cn |
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| Abstract: |
| College of Plant Protection, Shandong Agricultural University, Key Laboratory of Pesticide Toxicology and Application Technique, Tai'an 271018, China) Abstract:Photodegradation and photostability of chemicals have profound impacts on their effectiveness and ecotoxicity. This study investigated the photodegradation of pyraclostrobin in water environment and the effect of microencapsulation on its photostability under irradiation of UV lamp. The photochemical degradation of pyraclostrobin could be characterized by first-order kinetic equation and was negatively correlated with its initial concentrations of 0.80~10.00 mg·L-1. The degradation rates of pyraclostrobin in different types of water were in sequence of deionized water> tap water> pond water> purified drinking water >river water. The photochemical degradation increased as H2O2 concentrations increased from 0.03 mmol·L-1 to 7.94 mmol·L-1. In the treatments with 7.94 mmol H2O2 mg·L-1, the photolysis rate was 1.14 times higher than in the control. Microencapsulation decreased the photodegradation of pyraclostrobin in water. The photolysis rates of 20% pyraclostrobin microcapsule suspension(CS) at 2.00, 4.00 mg·L-1, and 10.00 mg·L-1 were less than 57.90% after 132 h. These results would advance our understanding of reasonable application and environmental safety assessment of pyraclostrobin. |
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