氮吹终点对黄瓜中三种不同挥发性农药回收率的影响

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中图分类号：S481.8 文献标志码：A

文章编号：1674-0270（2025）36-0105-03

Effect of Nitrogen Blow-Down Endpoint on the Recovery Rates of Three Pesticides with Different Volatilities in Cucumber

GAO Sainan, JIANG Xiumei, ZHOU Yang (Huaian Agricultural Product Quality Supervision and Testing Center, Huaian 223OOo,China)

Abstract:This study aims to investigate the differential effcts of purging time and heating conditions on the recovery rates ofdiferent volatilepesticides during nitrogen blow-down concentration,providinga basis foraccurate quantification. Using cucumber as the matrix and using GC-MS/MS method,three representative pesticides—dichlorvos, chlorpyrifos,andprocymidonewereselected.Sevendryingonditions weredesigned,includingfivegradientnitrogenblowdown endpoints andtwo natural evaporationconditions.Fortified recovery experiments were conducted attwo concentration levels.Dichlorvos is extremelysensitive to nitrogen blow-down time.After complete drying, purging iscontinued for5,10, and 20 minutes, leading to a dramatic decrease in its recovery rates to 31.67% ， 10.33% ,and 7.00% (at the 0.05 μg/mL level),respectively. In contrast, the recovery rates of procymidone and chlorpyrifos remain within 70% ， 120% ( SRSD

Key Words:nitrogen blow-down endpoint; recovery rate; GC-MS/MS

氮吹浓缩作为农药残留分析前处理中的关键步骤，旨在将净化后的样品溶液浓缩至微小体积，以提高方法灵敏度。（剩余5247字）