印楝素在甘蓝及土壤中的消解动态

杨晓云; 黄其亮; 江腾辉; 徐汉虹

doi:10.7671/j.issn.1001-411X.2017.04.006

印楝素在甘蓝及土壤中的消解动态

Degradation dynamics of azadirachtin in cabbage and soil

摘要

摘要:
目的甘蓝Brassica oleracea生长期施用w为0.3%的印楝素乳油，检测印楝素在甘蓝和土壤中的残留及消解动态。
方法印楝素在0.05~5.00 mg·kg^-1水平范围内取0.1、0.5、1.0 mg·kg^-1添加，样品中的印楝素经乙腈超声波辅助提取，弗罗里硅土固相萃取柱净化，高效液相色谱(HPLC)检测，外标法定量。
结果印楝素在甘蓝中的平均回收率为88.52%~93.21%，相对标准偏差为2.75%~3.55%；在土壤中平均回收率为90.69%~93.32%，相对标准偏差为2.09%~3.46%。印楝素在甘蓝中的残留半衰期为0.89 d，在土壤中的残留半衰期为2.40 d。
结论印楝素属易降解农药。该施药方法安全可靠，值得借鉴。

Abstract:
Objective To identify the residual and degradation dynamics of azadirachtin in cabbage and soil after spraying 0.3%azadirachtin emulsifiable concentrate during the growth period of cabbage (Brassica oleracea).
Method Azadirachtin was added with three concentrations of 0.1, 0.5 and 1.0 mg·kg^-1 within the range from 0.05 to 5.00 mg·kg^-1. Azadirachtin was extracted from cabbage and soil using acetonitrile assisted with ultrasonic, purificated using a florisil solid phase extraction column, detected by HPLC and quantified by external standard method.
Result The average recovery rates of azadirachtin in cabbage ranged from 88.52% to 93.21% with relative standard deviations ranging from 2.75% to 3.55%, and the average recovery rates in soil were ranged from 90.69% to 93.32% with relative standard deviations ranging from 2.09% to 3.46%.The half-lives of azadirachtin in cabbage and soil were 0.89 and 2.40 d respectively.
Conclusion Azadirachtin is an easily degradable pesticide. Application of 0.3% azadirachtine mulsifiable concentrate is safe and recommended.

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