JIN Yinyin, LI Chenchen, ZHU Yunlong, LI Zongjie, LIU Yanxia, FU Kang, CHAI Tingting, CUI Feng. Effects of micro-plastics on stereoselective degradation behavior of mefentrifluconazole in paddy environment[J]. Chinese Journal of Pesticide Science, 2022, 24(5): 1278-1286. DOI: 10.16801/j.issn.1008-7303.2022.0113
    Citation: JIN Yinyin, LI Chenchen, ZHU Yunlong, LI Zongjie, LIU Yanxia, FU Kang, CHAI Tingting, CUI Feng. Effects of micro-plastics on stereoselective degradation behavior of mefentrifluconazole in paddy environment[J]. Chinese Journal of Pesticide Science, 2022, 24(5): 1278-1286. DOI: 10.16801/j.issn.1008-7303.2022.0113

    Effects of micro-plastics on stereoselective degradation behavior of mefentrifluconazole in paddy environment

    • To investigate the enantioselective behavior of mefentrifluconazole (MFZ) in paddy environment under field conditions, the residue analytical methods of the two MFZ enantiomers in dpaddy plants, roots, soil and field water were established based on HPLC-MS/MS. In addition, the effect of micro-plastics on the enantioselective behavior and degradation of MFZ was also investigated by paddy-pot experiment. The results showed that: the MFZ enantiomers were completely separated on the Chiralpak IG chiral column, and there was a good linear relationship between the peak area of the enantiomers and the corresponding mass concentration in the range of 0.0005-0.1 mg/L (R2 was greater than 0.999). The average recoveries in the four matrixs were 76%-108% and the relative standard deviations (RSD) were 1.3%-12%. The paddy-pot experiment showed that there were no significant enantioselectivity difference in the degradation of MFZ in all the four matrices (P>0.05). The micro-plastics had no significant effect on the enantioselective behavior of MFZ in the paddy environment (P>0.05), however micro-plastics significantly prolonged the half-life of the MFZ in paddy water and rice plant. The half-life of R-MFZ and S-MFZ were prolonged from 6.7 and 6.7 d to 11.6 and 11.7 d in paddy water, while in rice plant it was extended from 7.5 and 7.4 d to 11.7 and 11.6 d, respectively. The results of this study provided the insight for the rational use of MFZ in the paddy environment.
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