title: Utilizing a novel sorbent in the solid phase extraction for simultaneous determination of 15 pesticide residues in green tea by GC/MS.
abstract: Pesticide residues exceeding standard in green tea is a widespread problem of the world's attention, containing organochlorine pesticides (OCPs), organophosphorus pesticides (OPPs), and pyrethroids. In this research, three dimensionally honeycomb Mg-Al layered double oxide (TDH-Mg-Al-LDO) combined with graphitized carbon black (GCB), packed as a column, was used as a novel solid phase extraction sorbent, applying in simultaneous determination of 15 pesticide residues in green tea coupled with GC-MS. Compared with different type of SPE column, it showed that TDH-Mg-Al-LDO exhibited great advantages in the extraction of 15 pesticide residues from green tea, which was seldom reported before. Different experiment conditions, such as combination order of Mg-Al-LDO and GCB, dosage of sorbents, type and volume of eluting solvent were thoroughly studied and optimized. The limits of detection (LODs) of 15 pesticides ranged from 0.9 to 24.2ng/g and the limits of quantifications (LOQs) were ranging from 3.0 to 80.0ng/g. The recoveries using this method at three spiked concentration levels (10, 100 and 500ng/g for Fenthion, P,P'-DDE, O,P'-DDT, P,P'-DDD and Bifenthrin, 100, 500 and 2000ng/g for the others) range from 71.1 to 119.0%. The relative standard deviation (RSD) was from 0.1 to 7.6% in all case. The result indicated that the proposed analytical method had been successfully applied for the simultaneous determination of 15 pesticide residues in commercial green tea.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Feifei
authors.initials: F
authors.lastname: Huo
authors.affiliation: Division of Metrology in Chemistry, National Institute of Metrology, Beijing 100013, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Tang
authors.affiliation: Division of Metrology in Chemistry, National Institute of Metrology, Beijing 100013, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Wu
authors.affiliation: Division of Metrology in Chemistry, National Institute of Metrology, Beijing 100013, China.
authors.forename: Dazhou
authors.initials: D
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Tan
authors.initials: T
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Pei
authors.initials: P
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: lilei@mail.buct.edu.cn.
authors.forename: Lei
authors.initials: L
authors.lastname: Li
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D010087:Oxides / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000379:methods*; D013662:Tea / Q000737:chemistry*
chemical_list: D010087:Oxides; D010573:Pesticide Residues; D013662:Tea
keywords: GC–MS; Green tea; Pesticide residues; Solid phase extraction; TDH-Mg-Al-LDO