毒死蜱在梨和土壤中的残留研究  

Study on the Chlorpyrifos Residues in Pear and Soil

作　　者：赵丽娟[1] 张洪[1,2] 秦曙[1] 王霞[1] 乔雄梧[1] 

机构地区：[1]山西省农药重点实验室,山西太原030031 [2]山西分析测试中心,山西太原030006

出　　处：《农药科学与管理》2010年第2期42-46,共5页Pesticide Science and Administration

摘　　要：毒死蜱在梨果上的残留动态和最终残留试验,用带有火焰光度检测器的气相色谱测定其残留量。其最小检出量为0.1ng,在梨和土壤中的最低检测浓度均为0.05mg/kg。在梨和土壤中的平均回收率为85%～98%,变异系数为0.88%～3.23%,符合农药残留分析的要求。研究结果表明,毒死蜱在梨上的半衰期为5.2d,在土壤中的半衰期为5.6d。毒死蜱按推荐剂量250a.i.mg/L和推荐剂量的2倍500a.i.mg/L使用2、3次,末次施药距收获间隔7～28d,毒死蜱在梨中的残留量为0.05～0.347mg/kg,土壤中为0.05～0.102mg/kg,残留量低于我国规定的毒死蜱在梨中的MRL值1mg/kg,欧盟、日本规定毒死蜱在梨上的最高残留限量0.5mg/kg,美国规定毒死蜱在梨上的最高残留限量0.05mg/kg。建议毒死蜱在梨上按推荐施用剂量250a.i.mg/L,施药2～3次,安全间隔期为7d。The study on chlorpyrifos residues in pear and soil was carried out.The residues were determined using GC-FPD,the limit of detection of the GC method was 0.1ng,the limits of concentration detected were both of 0.05mg/kg for pear and soil.the average recoveries were 85%～98%,and the relative standard deviations were 1.7%～13.3%,which were met with the requirements of pesticide residue analysis.The results showed that the half-life of chlorpyrifos in pear and soil were 5.2 and 5.6 days respectively,the final residues of chlorpyrifos were 0.05～0.347mg/kg in pear,and 0.05～0.102mg/kg in soil,when sprayed with chlorpyrifos for 2 or 3 times at the dosages of 250mg/L and 500mg/L,and with intervals of 7～28 days before harvest,It did not exceed the Chinese MRL of 1 mg/kg and EU and Japanese MRLs of 0.5mg/kg on/in pear.So the use pattern of chlorpyrifos were recommended as 2～3 times application at a dosage of 250mg/L and with a PHI of 7 days.

关 键 词：毒死蜱 残留 消解 梨 

分 类 号：S481.8[农业科学—农药学] S482.3[农业科学—植物保护]