Rapid Determination Method for 12 Pyrethroid Pesticide Residues in Tea by Stir Bar Sorptive Extraction-Thermal Desorption-Gas Chromatography

The 12 pyrethroid Pesticides residues in tea samples can be rapidly extracted and separated by a noval stir bar sorptive extraction(SBSE)-thermal desorption(TDU)-gas chromatography(GC) method. Impurities and pyrethroid pesticides residues of tea can be seperated by this method. and then use TDU-GC to analyse pyrethroid Pesticides residues. The residues of 12 pyrethroid pesticides at same time can be identified and quantified simultaneously by SBSE-TDU-GC rapidiy with high sensitivity and good reproducibility. This method is simple, rapid, and the average adding standard recovery ratios were 92.89%-105.01%. The correlation coefficient of pyrethroid pesticides in tea samples is 0.9926. Good repeatability(n=6) was obtained in all the cases with The relative standard deviation lower 9.7%. Pyrethroid pesticides residues in 4 real tea samples can be determined rapidly by this method, their pyrethroid pesticide residues are all less than MRL of China and European union. (C) 2012 Published by Elsevier B.V. Selection and/or peer-review under responsibility of Garry Lee