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Multi-residue analysis of pesticides in tea by online SEC-GC/MS

✍ Scribed by Xiao-Min Xu; Cun Yu; Jian-Long Han; Jia-Ping Li; Fawzi El-Sepai; Yan Zhu; Bai-Fen Huang; Zeng-Xuan Cai; Hong-Wei Wu; Yi-Ping Ren

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
216 KB
Volume
34
Category
Article
ISSN
1615-9306

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✦ Synopsis

Abstract

A multi‐residue method for the analysis of pesticides in tea was developed by online size exclusion chromatography (SEC)‐GC/MS with full scan mode. The sample was fortified with chlorpyrifos‐d~10~ isotope internal standard and extracted by acetonitrile. After purification by primary secondary amine sorbent and solvent exchange by SEC mobile phase, the sample was detected by online SEC‐GC/MS. The purification result of the online system was evaluated by comparing the correlation between Chinese cabbage and tea matrix. The factors for method optimization included sample preparation, matrix effects and the instrument parameters of each online component. Scatter plot was introduced in this study to directly illustrate the results of the condition optimization and matrix effects in the online system. For most of the pesticides, the average recoveries ranged from 70 to 130% and the RSD were below 15%. The feasibility of the application of full scan mode in multi‐residue determination of trace amounts of pesticides (LODs below 0.01 mg/kg) in a complex matrix was discussed.

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