【摘要】 本试验以生菜为材料，研究了3种贮存方式（室温25℃、冷藏4℃、冷冻-20℃）对生菜中有机氯类农药（乙烯菌核利、联苯菊酯、甲氰菊酯）检测结果的影响。结果表明，联苯菊酯稳定性高于甲氰菊酯和乙烯菌核利；样品贮存3 d时，室温贮存效果最好；样品贮存5 d时，冷冻贮存效果优于冷藏；农药浓度为0.05 mg/kg时，表现出更好的稳定性，在样品贮存3～5 d后残留率在3个浓度中最高；随着样品冻融次数增多，农药降解的速度加快，检测结果偏低，冻融3次后，3种农药残留率在70%及以下，因而冻融3次后的样品不宜再作为农残检测样品进行检测。更多还原

【Abstract】 In this experiment, lettuce was used as the material to study the effects of three storage methods(room temperature at 25 ℃, freezing at 4 ℃, and freezing at-20 ℃) on the detection results of organochlorine pesticides(vinclozolin, bifenthrin, fenothrin) in lettuce. The results showed that the stability of bifenthrin was higher than that of fenothrin and vinclozolin. When samples stored for 3 days, the storage effect at 25 ℃ was the best, and when samples stored for 5days, the storage effect at-20 ℃ was better than that at 4 ℃. When the pesticide concentration was 0.05 mg/kg, it showed better stability, and the residue rate was the highest among the three concentrations after samples storaged for 3-5 days.As the number of freeze-thaw cycles of the samples increased, the degradation rate of pesticides accelerated, and the detection results were low. After 3 times of freeze-thaw, the residues of 3 pesticides were at or below 70%. Therefore, the samples after 3 times of freeze-thaw should not be used as pesticide residue testing samples for detection.更多还原