金银银, 李晨琛, 朱云龙, 李宗杰, 刘艳霞, 符康, 柴婷婷, 崔峰. 微塑料对氯氟醚菌唑在水稻环境中的立体选择性降解行为的影响[J]. 农药学学报, 2022, 24(5): 1278-1286. DOI: 10.16801/j.issn.1008-7303.2022.0113
    引用本文: 金银银, 李晨琛, 朱云龙, 李宗杰, 刘艳霞, 符康, 柴婷婷, 崔峰. 微塑料对氯氟醚菌唑在水稻环境中的立体选择性降解行为的影响[J]. 农药学学报, 2022, 24(5): 1278-1286. DOI: 10.16801/j.issn.1008-7303.2022.0113
    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

    微塑料对氯氟醚菌唑在水稻环境中的立体选择性降解行为的影响

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

    • 摘要: 为明确手性农药氯氟醚菌唑 (mefentrifluconazole,MFZ)在水稻环境中的立体选择性行为,本研究基于高效液相色谱-串联质谱 (HPLC-MS/MS)法建立了氯氟醚菌唑对映体在水稻植株、根系、土壤和田水中的残留测定方法,并通过水稻环境盆栽模拟试验,考察了氯氟醚菌唑在水稻环境中的行为规律及微塑料对氯氟醚菌唑在水稻环境中的立体选择性及降解动态的影响。结果表明:氯氟醚菌唑对映体在手性柱Chiralpak IG上可完全分离,且在0.0005~0.1 mg/L范围内,对映体的峰面积与相应的质量浓度间呈良好线性关系 (R2均大于0.999),其在水稻环境样本中的平均回收率为76%~108%,相对标准偏差 (RSD)为1.3%~12%。盆栽模拟试验结果表明,氯氟醚菌唑对映体在水稻植株、根系、土壤和田水中均无立体选择性差异 (P>0.05);微塑料对氯氟醚菌唑在水稻环境中的立体选择性无显著影响 (P>0.05),但可显著延长其在田水和水稻植株中半衰期。氯氟醚菌唑R体和S体在田水中的半衰期分别从6.7和6.7 d延长至11.6和11.7 d,在水稻植株中则分别从7.5和7.4 d延长至11.7和11.6 d。该结果可为氯氟醚菌唑在水稻环境中的合理使用提供参考。

       

      Abstract: 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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