吡蚜酮在水稻和稻田中的残留降解行为研究

为评价吡蚜酮及其制剂在稻田使用后的生态环境安全性。指导吡蚜酮及其制剂的科学合理使用，借助高效液相色谱分析技术，通过添加回收率试验，研究并建立了吡蚜酮在稻田样品中的残留分析方法，在稻田水体和土壤中残留降解行为。吡蚜酮在稻田水、土壤和水稻植株中的降解半衰期分别为7．34～9．07d、13．35～14．53d、11．2I～11．45d；最小检出浓度为7.5×10^-3mg/kg。最小检出量为3．0×10^-10g；添加回收率达80％以上。

Residue and Degradation Behavior of Pymetrozine in Paddy Field

A study on residue behavior of pymetrozine in paddy field was carried out. A HPLC method for the determination of pymetrozine residue was used. The mobile phase was consisted of CH3OH and H20 at a ratio of 30：70 （by vol） and with a flow rate of 1.0mL/min. The minimum detectable concentration of the method was 7.5×10^-3mg/kg. The results showed that the dissipation rates of pymetrozine in rice soil and rice water were fast with half-lives of less than 15d. the final residue in rice samples were not detecteded when the last spray of pymetrozine products was 40d befor harvest.