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中国农学通报

中国农学通报 ›› 2014, Vol. 30 ›› Issue (13): 157-160.doi: 10.11924/j.issn.1000-6850.2013-2674

• 林学 园艺 园林 • 上一篇    下一篇

乐果在香蕉、土壤中的残留动态及安全性评价

蔡恩兴 郭建辉 陈丽萍   

  • 收稿日期:2013-10-12 修回日期:2014-01-02 出版日期:2014-05-05 发布日期:2014-05-05
  • 基金资助:
    福建省农业科技计划重点项目 “香蕉产品质量安全监测及绿色食品生产技术规程” (2007N0067)。

Residual Dynamics and safety assessment of Dimethoate in Bananas & the Orchard Soil

  • Received:2013-10-12 Revised:2014-01-02 Online:2014-05-05 Published:2014-05-05

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摘要： 为了在香蕉上科学、安全地使用乐果，研究了乐果在香蕉和土壤中的残留降解动态。采用气相色谱法和田间试验方法，依据GB/T 5009.20—2003和GB/T 14552—2003对乐果的残留量进行测定，结果表明：在香蕉中，乐果有一定原始沉积量，其残留降解规律符合一级动力学关系，推荐剂量和加倍剂量2种不同处理的降解动态方程分别为C＝1.4009·e-0.2404t、C＝2.2820·e-0.2369t，半衰期(T1/2)分别为2.9、3.0天；在土壤中，乐果的残留降解动态方程为C＝4.5025·e-0.2348t，T1/2为3.0天。距第2次施药后62~66天，最终产品残留量在香蕉及其土壤中均未检出乐果残留量（检出限为0.005 mg/kg）。福建蕉区在香蕉生产上科学合理施用乐果，最终产品质量可符合NY/T 750—2011中规定的MRL要求，同时最终对蕉园土壤环境不会造成污染。

关键词: 检测方案, 检测方案

Abstract: In order to apply dimethoate scientifically and safely in bananas, the residue dynamics of dimethoate in bananas and the soil was studied. Using the methods of GC and field experiments, dimethoate residue were detected according to GB/T 5009.20-2003 and GB/T 14552-2003. The results showed that there was a certain amount of initial dimethoate residue in the bananas. The residual degradation dynamics of dimethoate could be followed first order kinetic equation, which the equation of dimethoate residual dynamics of recommended and double dosage were C＝1.4009·e-0.2404t and C＝2.2820·e-0.2369t, with T1/2 were 2.9 d and 3.0 d respectively. The equation of dimethoate residual dynamics in the soil was C＝4.5025·e-0.2348t, with T1/2 was 3.0 d. The final products residue in the bananas and the orchard soil had not been detected (detection limit of 0.005 mg/kg) after the second application for 62-66 d. Scientifically and rationally use of dimethoate in Fujian, the final product quality could accord with the maximum residue limit (MRL) established in NY/T 750- 2011, and eventually not cause pollution of soil environment.