Dynamic Microwave-assisted Extraction Online Coupled with QuEChERS for the Determination of Organophosphorus Pesticides in Cereals by Gas Chromatography  

作　　者：LI Guijie LIU Chang LIU Hongcheng WANG Dawei DING Lan 

机构地区：[1]College of Food Science,Jilin Agricultural University,Changchun 130118,P.R.China [2]College of Chemistry,Jilin University,Changchun 130012,P.R.China [3]Jilin Province Product Quality Supervision and Inspection Institute,Changchun 130103,P.R.China

出　　处：《Chemical Research in Chinese Universities》2020年第5期768-773,共6页高等学校化学研究（英文版）

基　　金：Supported by the National Key R&D Program of China(No.2018 YFD040013).

摘　　要：A rapid analytical method was first developed to detect organophosphorus pesticides(OPPs)in cereals,which used dynamic microwave assisted extraction(DMAE)coupled online with a modified quick,easy,cheap,effective,rugged,and safe(QuEChERS)method.Cereals samples were mixed with a certain amount of quartz,Ci8 and the primary second amine(PSA),and extracted successively with the acetonitrile-water solution(80%,VIV)under microwave irradiation.The obtained eluate was directly introduced into a collection tube containing NaCl and MgSO4.Finally,the supemate was evaporated and reconstructed,and determined by gas chromatographic spectrometry.Some factors affecting the experimental results were studied and optimized.The extraction and purification processes were carried out coinstantaneously and 12 samples could be treated in one step in 4 min.Low limits of tection(0.43—1.31 p.g/kg)for OPPs were obtained in cereals.The relative standard deviations(RSDs)were 2.1%—9.3%.The recoveries of OPPs ranged from 76.1%to 100.2%.By combining the advantages of DMAE with QuEChERS,the sample pretreatment process was simple to operate,with little amount of organic solvent.The whole extraction process was completed in a closed environment,therefore it was very appropriate for daily analysis of OPPs in cereals.

关 键 词：Dynamic microwave-assisted extraction Quick easy cheap effective rugged and safe(QuEChERS) Gas chromatographic spectrometry Organophosphorus pesticide CEREAL 

分 类 号：O65[理学—分析化学]