| 噻虫胺在梨中的残留及消解动态 |
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投稿时间：2018-05-07
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| 引用本文：兰丰,柳璇,李晓亮,等.噻虫胺在梨中的残留及消解动态[J].农药学学报,2018,20(6):814-818. |
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| 基金项目:国家果品质量安全风险评估专项（GJFP2018003） |
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| 中文摘要:建立了固相萃取-超高效液相色谱检测梨中噻虫胺残留量的分析方法，并对20%噻虫胺悬浮剂在梨中的残留及消解动态进行了研究。样品经乙腈匀浆提取，NH2柱净化，超高效液相色谱-二极管阵列检测器（UPLC-PDA）检测，外标法定量。结果表明：在0.05～2.5 mg/kg添加水平下，噻虫胺在梨中的平均回收率为95%～103%，相对标准偏差为2.0%～3.3%；噻虫胺在梨中的定量限为0.05 mg/kg。消解动态试验结果显示，噻虫胺在梨中的消解动态规律符合一级反应动力学方程，其半衰期为12.0～16.4 d。最终残留试验表明：按有效成分质量浓度0.06和0.09 g/L，施药2～3次，距最后一次施药21 d后采样，梨中噻虫胺的残留量为<0.05～0.13 mg/kg，低于国际食品法典委员会（CAC）制定的最大残留限量（MRL）值（0.4 mg/kg）。 |
| 中文关键词:噻虫胺 梨 残留 消解动态 最大残留限量 |
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| Residues and dissipation of clothianidin in pears |
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| Abstract:Residues and dissipation of clothianidin (20% SC) in pears were investigated in three locations through a two-year field experiment. Clothianidin in pears was determined by utra high performance liquid chromatography with photo-diode array detector. The samples were extracted by acetonitrile, cleaned up by the NH2 column, and quantified by external standard method. At the fortified level of 0.05 to 2.5 mg/kg, the recoveries of clothianidin ranged from 95% to 103% with the relative standard deviations of 2.0% to 3.3%. The limit of quantification (LOQ) of this method was 0.05 mg/kg. The half-lives of clothianidin in pears were 12.0 d to 16.4 d. When the recommended dosage (a.i, 0.06 g/L) and 1.5 times of the recommended dosage (a.i, 0.09 g/L) of clothianidin (20% SC) were sprayed for 2-3 times, the terminal residues of clothianidin ranged from <0.05 mg/kg to 0.13 mg/kg 21 days after the last application. The final residues of clothianidin in pears were lower than the MRL of CAC (0.4 mg/kg). |
| Key words:clothianidin pear residue residue decline maximum residue limit |
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