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[目的]明确氯虫苯甲酰胺在水稻上的残留行为,为氯虫苯甲酰胺的合理使用及其安全性评价提供科学依据。[方法]采用田间小区试验进行了氯虫苯甲酰胺在水稻植株和土壤中的消解动态和最终残留量研究。样品采用甲醇提取、弗罗里硅土固相萃取柱净化,超高效液相色谱串联质谱仪测定。[结果]水稻植株、糙米、稻壳和土壤中氯虫苯甲酰胺添加质量浓度为0.005~0.1 mg/L时,其平均添加回收率为82.71%~85.47%;相对标准偏差为0.87%~3.96%。方法的最低检测质量浓度为0.005 mg/L。氯虫苯甲酰胺在施用5~6 d后植株中的含量达到最大值(0.018~0.025 mg/kg);在土壤中的消解半衰期为5.53~8.58 d;在水稻糙米中的最终残留量均小于0.01 mg/kg。[结论]建议氯虫苯甲酰胺0.4%颗粒剂防治钻蛀性害虫应在防治适期前5~6 d施药,按推荐剂量42 g a.i./hm2,施用2次,最后1次施药距离收获间隔期为14 d。
[Objective] The study aimed to determine the residual behavior of chlorantraniliprole in rice and provide a scientific basis for rational use of chlorantraniliprole and its safety evaluation. [Method] The field experiment of chlorantraniliprole in rice plants and soil digestion dynamics and final residues were studied. The samples were extracted with methanol, purified with Florisil SPE, and analyzed by ultra performance liquid chromatography-tandem mass spectrometry. [Result] The average recoveries of chloramphenicol in rice plants, brown rice, rice husk and soil were between 82.71% and 85.47% with the concentrations of 0.005 ~ 0.1 mg / L, and the relative standard deviations were 0.87% ~ 3.96 %. The method of detection of the lowest concentration of 0.005 mg / L. Chlorantranilon reaches the maximum (0.018-0.025 mg / kg) in the plants after 5 ~ 6 d, and the digestion half-life in the soil is 5.53 ~ 8.58 d. The final residues in rice brown rice are less than 0.01 mg / kg. [Conclusion] It is suggested that the 0.4% granules of chlorantraniliprole for controlling boring pests should be applied 5 ~ 6 d before the control period. The recommended dosage of 42 g ai / hm2 is applied twice and the last application distance The harvest interval is 14 days.