title: High-Throughput Analytical Techniques for the Determination of the Residues of 653 Multiclass Pesticides and Chemical Pollutants in Tea, Part VII: A GC-MS, GC-MS/MS, and LC-MS/MS Study of the Degradation Profiles of Pesticide Residues in Green Tea.
abstract: GC-MS, GC-tandem MS (MS/MS), and LC-MS/MS were used to mathematically define the degradation profiles of pesticide residues in two field trials. Nineteen pesticides were studied in the first field trial and 11 in the second. The results of the field trials demonstrated that the degradation profiles of pesticide residues in green tea can be described with power functions to successfully estimate the amount of time, following pesticide application, pesticide residues appearing in tea in concentrations at and/or above the maximum residue limit (MRL) decrease to concentrations below the MRL. Stability tests on green tea samples stored at room temperature were conducted to determine whether pesticide-incurred green tea samples prepared according to the method used in the field trials would be suitable for the preparation of reference standards for laboratory-proficiency testing trials. This paper reports the results of a GC-MS, GC-MS/MS, and LC-MS/MS study, as well as the suitability of the samples prepared under these conditions for use as pesticide reference standards in tea analysis.
authors.affiliation: Yanshan University, College of Environmental and Chemical Engineering, Qinhuangdao, Hebei 066004, People's Republic of China.
authors.forename: Qiao-Ying
authors.initials: QY
authors.lastname: Chang
authors.affiliation: Yanshan University, College of Environmental and Chemical Engineering, Qinhuangdao, Hebei 066004, People's Republic of China.
authors.forename: Guo-Fang
authors.initials: GF
authors.lastname: Pang
authors.affiliation: Chinese Academy of Inspection and Quarantine, Beijing 100176, People's Republic of China.
authors.forename: Chun-Lin
authors.initials: CL
authors.lastname: Fan
authors.affiliation: Chinese Academy of Inspection and Quarantine, Beijing 100176, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.affiliation: Fujian Entry-Exit Inspection and Quarantine Bureau, Fuzhou, Fujian 350001, People's Republic of China.
authors.forename: Fang
authors.initials: F
authors.lastname: Yang
authors.affiliation: Fujian Entry-Exit Inspection and Quarantine Bureau, Fuzhou, Fujian 350001, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.affiliation: Fujian Chaoda Modern Agriculture Co., Fuzhou, Fujian 350003, People's Republic of China.
authors.forename: Bi-Fang
authors.initials: BF
authors.lastname: Wen
mesh_terms: D002849:Chromatography, Gas; D002853:Chromatography, Liquid; D004785:Environmental Pollutants / Q000032:analysis* / Q000145:classification*; D005504:Food Analysis / Q000379:methods*; D057166:High-Throughput Screening Assays / Q000379:methods*; D013058:Mass Spectrometry; D010573:Pesticide Residues / Q000032:analysis* / Q000145:classification*; D013662:Tea / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D010573:Pesticide Residues; D013662:Tea