毒死蜱在苹果果实、叶片及果园土壤中的残留分析研究

通过降解动态试验和最终残留量试验，研究了毒死蜱在苹果果实、叶片及树下土壤中的残留降解规律。结果表明，毒死蜱在苹果不同部位中的残留主要集中在果皮部分；在推荐浓度和使用次数下，毒死蜱在果实中的半衰期为24.50d，最低检测限量为0.012 mg/kg；毒死蜱在果实、叶片和土壤中的残留量与试药量和次数有关；毒死蜱的残留量与时间有函数关系，随着时间的增加，残留量逐渐减少，整个消解过程呈负指数函数变化；毒死蜱降解速率：叶片>果实>土壤，最终残留量：果实>土壤>叶片。

Residue determination of chlorpyifos in apple fruit,leaf and orchard soil

Experiment was conducted to investigate the residual dynamic of chlorpyrifos of ‘Gala’ apple’s fruit, leaf and soil in orchard by GC-TSD. The results showed that the pesticide residues was greatest in peel; chlorpyrifos half life of apple was 24.50d at the recommended concentration and times, the limit of determination was 0.012mg/kg; pesticide residue was related to concentration and times, there was a negative exponential function in dissolution process in the interval; the rate of residual dynamic of chlorpyrifos was leaf>aplle>soil, ultimately pesticide residue was aplle>soil>leaf.