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| Study on the photodegradation characteristics of mefentrifluconazole |
| Received:September 13, 2022 |
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| KeyWord:mefentrifluconazole;photolysis in liquid phase;photolysis on glass surface;photolysis on soil surface;photolysis products |
| Author Name | Affiliation | E-mail | | ZHONG Yanru | College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China | | | KONG Lingru | College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China | | | SUN Xiaofang | College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China | | | WANG Minghua | College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China | | | SHI Haiyan | College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China | yanzishy@njau.edu.cn |
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| Abstract: |
| In order to clarify the photolysis law of mefentrifluconazole, a liquid chromatography method for the residue analysis of mefentrifluconazole in aqueous solution and soil was established. Based on the above method, the kinetic parameters and influencing factors of the photochemical degradation of mefentrifluconazole in liquid phase, on glass surface and on soil surface were systematically studied, and the photolysis products in acetonitrile were identified. The results showed that the photolysis rate of mefentrifluconazole decreased with the increase of the initial concentration. The photolytic rate of mefentrifluconazole was faster under both neutral and alkaline conditions, and the degradation rate was the slowest under acidic conditions. The half-life of mefentrifluconazole was 32 times that under neutral conditions. It was found that pyraclostrobin could inhibit the photochemical degradation of mefentrifluconazole, with the inhibition reaching the highest level when the mixture ratio of pyraclostrobin and mefentrifluconazole was 2:1, and the half-life was twice as long as that without pyraclostrobin. In addition, both Fe3+ and Fe2+ showed inhibitory effects on the photolysis of mefentrifluconazole, and at the same concentration, Fe3+ showed a higher photodegradation inhibition level. The photolysis rates of mefentrifluconazole in different organic solvents followed the rule of acetonitrile > methanol > ethyl acetate > n-hexane. The main photodegradation products in acetonitrile were 4-[2-hydroxy-1-(1H-1, 2, 4-triazol-1-yl) propan-2-yl]-5-(trifluoromethyl) benzene-1, 2-diol, 2-[4-phenoxy-2-(trifluoromethyl) phenyl]-1-(1H-1, 2, 4-triazol-1-yl) propan-2-ol and M750F005. Mefentrifluconazole is a pesticide where photodecomposition happens easily in the liquid phase and on glass slides, and with more difficulty on the soil surface. |
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