title: Determination of six neonicotinoid insecticides residues in spinach, cucumber, apple and pomelo by QuEChERS method and LC-MS/MS.
abstract: A modified QuEChERS and LC-MS/MS method has been developed for the simultaneous determination of residues of six neonicotinoids in various crops, including spinach, cucumber, apple and pomelo. The method showed good linearity (R(2) ≥ 0.9995) and precision (RSD ≤ 14.0%). Average recoveries of the six neonicotinoids ranged between 73.7% and 103.8% at spiking levels 0.005, 0.1 and 1 mg kg(-1). The LODs and LOQs were in the ranges of 0.20-0.85 μg kg(-1) and 0.66-2.84 μg kg(-1), respectively. The method was satisfactorily validated for the analysis of 50 agricultural samples. Imidacloprid and imidaclothiz were detected at concentration levels ranging from 7 to 5.3 μg kg(-1).
authors.affiliation: Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, 100193, People's Republic of China.
authors.forename: Fengzu
authors.initials: F
authors.lastname: Zhang
authors.forename: Yanjie
authors.initials: Y
authors.lastname: Li
authors.forename: Chuanshan
authors.initials: C
authors.lastname: Yu
authors.forename: Canping
authors.initials: C
authors.lastname: Pan
mesh_terms: D002853:Chromatography, Liquid; D002957:Citrus / Q000737:chemistry*; D018553:Cucumis sativus / Q000737:chemistry*; D005506:Food Contamination / Q000032:analysis; D007306:Insecticides / Q000032:analysis* / Q000737:chemistry; D027845:Malus / Q000737:chemistry*; D018722:Nicotinic Agonists / Q000032:analysis / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis; D011978:Receptors, Nicotinic / Q000378:metabolism; D018570:Risk Assessment; D018724:Spinacia oleracea / Q000737:chemistry*; D053719:Tandem Mass Spectrometry
chemical_list: D007306:Insecticides; D018722:Nicotinic Agonists; D010573:Pesticide Residues; D011978:Receptors, Nicotinic