title: Multiresidue method for the determination of pesticides in Oolong tea using QuEChERS by gas chromatography-triple quadrupole tandem mass spectrometry.
abstract: We propose a simple, rapid analytical method for determination of 89 pesticides in Oolong tea by GC/MS/MS. Samples were extracted via QuEChERS. The limits of detection and quantification range of the 89 pesticides were 1-25μgL-1and 10-50μgL-1, respectively. Good separation was attained in less than 36min. A wide linear range of 1-250μgL-1was observed with r2values from 0.9955 to 0.9998. Pesticide-free tea powder spiked at 50 and 100μgL-1. Recovery ranges of the 86 (50μgL-1) and 83 (100μgL-1) pesticides were from 60% to 120%. Relative standard deviations were less than 20%. The laboratory proficiency test (FAPAS, 2014) shows satisfactory (|z|<2) z-score values. The proposed monitoring technique rapidly and efficiently screens, multiple pesticides in Oolong tea.
authors.affiliation: Veterans Affairs Council, Fushoushan Farm, Taichung Heping 42492, Taiwan, ROC. Electronic address: wu0933036183@gmail.com.
authors.forename: Chia-Chang
authors.initials: CC
authors.lastname: Wu
mesh_terms: D059022:Food Safety; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D010575:Pesticides / Q000032:analysis / Q000737:chemistry*; D053719:Tandem Mass Spectrometry / Q000379:methods; D013662:Tea / Q000737:chemistry*
chemical_list: D010575:Pesticides; D013662:Tea
keywords: GC/MS/MS; Oolong tea; Pesticide residues; QuEChERS