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[目的]由于中药材作物上农药登记严重不足,滥用现象严重。以高效氯氟氰菊酯为例,对中药材金银花上施用后的残留动态进行研究,为金银花的安全使用提供科学依据。[方法]分别在山东、河南主产区进行田间试验,样品用气相色谱电子捕获检测器测定,用样品残留量和时间进行拟合得到残留动态方程。[结果]高效氯氟氰菊酯在金银花中的残留动态符合一级动力学方程,半衰期为1.8~2.9 d。在施药量为13.5 g a.i./hm~2的情况下,2014、2015年距末次施药7 d后金银花中的最大残留量分别为0.94、0.67 mg/kg,低于1 mg/kg。[结论]参照我国国标及欧州药典规定的最大残留限量,5%高效氯氟氰菊酯微乳剂在金银花上使用,施药量为13.5 g a.i./hm~2,施药1次,采收间隔期设定为7 d,最终残留水平低于1 mg/kg,为其安全评价提供了依据。
[Objective] Due to serious shortage of pesticide registration on crops of Chinese herbal medicines, the phenomenon of abuse is serious. In the case of lambda-cyhalothrin, we studied the residual dynamics of honeysuckle on Chinese medicinal materials and provided a scientific basis for the safe use of honeysuckle. [Method] Field experiments were carried out in main producing areas of Shandong and Henan respectively. The samples were determined by gas chromatography electron capture detector. The residual dynamic equation was obtained by fitting the sample residue and time. [Result] The residual activity of lambda-cyhalothrin in Honeysuckle accord with the first-order kinetic equation with a half-life of 1.8-2.9 d. In the case of 13.5 g a.i./hm~2, the maximum residues of honeysuckle in the year 2014 and 2015 were 0.94 and 0.67 mg / kg, respectively, less than 1 mg / kg after 7 days. [Conclusion] The 5% lambda-cyhalothrin microemulsion was applied on honeysuckle with the dosage of 13.5 g ai / hm ~ 2 and the pesticide application interval of 1, according to the maximum residue limit stipulated in China’s national standard and the European Pharmacopoeia. The period was set at 7 days, and the final residual level was below 1 mg / kg, which provided the basis for its safety evaluation.