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Determination of 22 Banned Pesticides Residues in Tea by Solid Phase Extraction and Gas Chromatography Mass Spectrometry

LU Xiao-lei;JIANG Mei-rong;YE Mei-jun;ZHOU Wei-long;Hangzhou Tea Research Institute,CHINA COOP, China National Center of Quality Supervision and Inspection of Tea;Zhejiang Economic and Trade Polytechnic;  
A method was developed for determination of 22 banned pesticides residues in tea by gas chromatography mass spectrometry(GC-MS). The sample was homogenized by acetonitrile and cleaned-up by CarbNH2 SPE column, finally determinated by GC-MS coupled with DB-5 column. The Results indicated that the correlation coefficients(R) of standard working curve in tea matrix(0.05 ~1.00 μg/m L)were above 0.99. The recoveries of 22 pesticides were between 65% and 120% at spiked levels of 1.00, 0.25 and 0.025 mg/kg, with relative standard deviations(RSDs) below 10%. The limits of quantitation(LOQ) were 0.001 ~0.031 mg/kg. The present method is rapid, stable and precise, and suitable for the determination of banned pesticides in tea.
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