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中国农学通报 ›› 2020, Vol. 36 ›› Issue (34): 124-128.doi: 10.11924/j.issn.1000-6850.casb20191200974

所属专题: 水稻

• 植物保护·农药 • 上一篇    下一篇

丙炔噁草酮在水稻及稻田环境中的残留消解动态

褚玥1(), 段劲生1, 董旭1, 孙明娜1, 童舟1, 肖青青2, 高同春1, 王梅1()   

  1. 1安徽省农业科学院植物保护与农产品质量安全研究所/农业农村部农产品质量安全风险评估实验室(合肥),合肥 230031
    2合肥学院生物与环境工程系,合肥 230601
  • 收稿日期:2019-12-20 修回日期:2020-06-11 出版日期:2020-12-05 发布日期:2020-12-15
  • 通讯作者: 王梅
  • 作者简介:褚玥,女,1987年出生,安徽肥东人,助理研究员,硕士,主要从事农药残留与农产品质量安全方面的研究工作。通信地址:230031 安徽省合肥市农科南路39号,Tel:0551-65160945,E-mail: chuychu@163.com
  • 基金资助:
    国家重点研发计划课题“水稻化肥农药减施增效技术评估和配套政策研究”(2016YFD0200803);国家重点研发计划“农田生态系统化肥农药减施增效技术环境效应综合评价”(2016YFD0201205);国家重点研发计划“大豆种植体系中农药沉降行为及减施因素”(2016YFD0200207);安徽省产业体系岗位专家“安徽省农业生态环保与质量安全产业技术体系”(AHCYJSTX-15)

Residues and Degradation Dynamics of Oxadiargyl in Rice and Environment

Chu Yue1(), Duan Jinsheng1, Dong Xu1, Sun Mingna1, Tong Zhou1, Xiao Qingqing2, Gao Tongchun1, Wang Mei1()   

  1. 1Institute of Plant Protection and Agro-products Safety, Anhui Academy of Agricultural Sciences/ Key Laboratory of Agro-product Safety Risk Evaluation (Hefei), Ministry of Agriculture and Rural Affairs, Hefei 230031
    2Department of Biological and Environmental Engineering, Hefei University, Hefei 230601
  • Received:2019-12-20 Revised:2020-06-11 Online:2020-12-05 Published:2020-12-15
  • Contact: Wang Mei

摘要:

为科学评价丙炔噁草酮在水稻田中安全性,采用田间试验方法,监测了丙炔噁草酮在水稻和稻田环境中的残留消解动态及最终残留量。稻壳样品采用二氯甲烷提取,稻田水、土壤、植株和糙米样品用乙腈振荡提取,经玻璃层析柱净化,气相电子捕获检测器分析测定。结果表明:稻田水、土壤、植株、稻壳和糙米中丙炔噁草酮添加浓度为0.01~1.0 mg/kg时,平均添加回收率为82.4%~99.6%,相对标准偏差为1.62%~7.56%,方法最低检测浓度均为0.01 mg/kg。丙炔噁草酮在田水、土壤和植株中的消解规律均符合一级动力学方程Ct=Coekt,消解半衰期分别为2.4~5.4、10.0~12.7、2.4~5.8天。以低剂量112.5 g a.i./hm2和高剂量168.75 g a.i./hm2施药丙炔噁草酮一次,收获期在土壤、植株、稻壳和糙米中的最终残留量均低于检出限。丙炔噁草酮在糙米中的残留量低于中国和欧盟规定的最大残留限量(MRL)标准。

关键词: 丙炔噁草酮, 残留, 消解, 水稻, 稻田环境, 气相色谱

Abstract:

To evaluate the safety of oxadiargyl in paddy field, a field experiment was conducted to study the residues and degradation dynamics of oxadiargyl in rice and environment. The residues of rice shell samples were extracted with dichloromethane, and paddy water, soil, rice plant and brown rice samples were extracted with acetonitrile, the samples were cleaned up by glass chromatographic column and determined by GC-ECD. The results showed that when the concentration of oxadiargyl in paddy water, soil, rice plant, rice shell and brown rice samples ranged from 0.01 to 1.0 mg/kg, the average recovery was 82.4%-99.6%, with the variation coefficient of 1.62%-7.56%, the minimum detectable mass fraction (LOQs) was 0.01 mg/kg. Degradation of oxadiargyl in paddy water, soil and rice plant conformed to chemical kinetic equation Ct=Coekt, with the half-life of 2.4-5.4, 10.0-12.7 and 2.4-5.8 days, respectively. Oxadiargyl was applied at the dosage of 112.5 and 168.75 g a.i./hm2, each for once, the final residue of oxadiargyl in soil, rice plant, rice shell and brown rice were all below the detection limits. The results reveal that the residue of oxadiargyl in brown rice is less than the MRL set by China and EU.

Key words: oxadiargyl, residue, dissipation, rice, rice field, GC

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