毒死蜱在冬季芹菜中的残留降解动态研究

为了探索芹菜中农药残留超标的可能原因，降低农药残留超标率，通过2年的降解动态试验，研究了毒死蜱在冬季大棚和露地芹菜中的残留降解动态以及在相同条件下与白菜的对照试验。结果表明，在不同剂量下，毒死蜱在大棚芹菜中的残留半衰期为11~12天，在白菜中的残留半衰期为4~6天，说明毒死蜱在大棚芹菜中的降解速率明显低于白菜。毒死蜱在露地芹菜中的半衰期在9~10天，比大棚降解快。因此，建议毒死蜱在芹菜上的安全间隔期应达到60天，同时实际芹菜种植过程中应加强对毒死蜱用药期的控制或用易降解的生物农药替代。

Study on Residue and Degradation Dynamics of Chlorpyrifos in Celery in Winter

In order to explore the possible reasons of the excessive pesticide residues in celery and reduce the over standard rate of pesticide residue, the author investigated the residue and degradation dynamics of chlorpyrifos in celery in winter greenhouse and open field by 2 years’ degradation dynamic tests, and conducted the control test on Chinese cabbage under the same condition. The results showed that the residue half-life of chlorpyrifos in greenhouse celery was 11-12 d under different doses, while it was 4-6 d in Chinese cabbage, which indicated that the degradation rate of chlorpyrifos in greenhouse celery was significantly lower than that of Chinese cabbage. The half-life of chlorpyrifos in open field celery was 9-10 d, which was faster than that in greenhouse celery. Therefore, the author suggested that the safety interval period of chlorpyrifos in celery should be 60 d, and the control of chlorpyrifos treatment should be strengthened or using the degradable biological pesticides in the process of celery production.