GC测定毒死蜱在苹果及其加工制品中的残留

Determination of Chlorpyrifos Residue in Apples and Their Processing Products by GC

采用田间喷药方式对苹果树喷洒毒死蜱农药，然后模拟苹果汁商业化加工过程进行加工，利用气相色谱对苹果、鲜榨苹果汁以及浓缩果汁中的毒死蜱进行检测，结果表明，果汁商业化榨汁过程可有效降低农药残留，鲜榨果汁中的农药残留仅为原料果中的0．4％～24.2％，而浓缩果汁中由于水分的流失，农药残留会出现大幅的提高。该法加标回收率为81．15％-106．02％，测定结果的相对标准偏差为7．6％～18．6％（n=5）。

The field spraying method was used to sprayed chlorpyrifos pesticide on apple trees. After simulating commercialization procedure to process apple juice, gas chromatography was employed to detect chlorpyrifos residue in apples, fresh apple juices and fruit juice concentrates. The results demonstrated that the commercialization process of juicing could decrease the chlorpyrifos residue effectively. Chlorpyrifos in fresh fruit juices were only 0.4%-24.2% of that in raw fruit materials.However, owing to the losing of water, ehlorpyrifos residue in fruit juice concentrates increased greatly. The recovery of the method was 81.15%-106.02%, the relative standard devation was 7.6%-18.6%（n=5）.