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Issue 12, 2012
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New sorptive extraction method based on polydimethylsiloxane sieve combined with GC-MS for determination of pyrethroid residues in tea

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Abstract

In this study, a polypropylene sieve with porous network structure was coated with polydimethylsiloxane (PDMS) and used as extraction phase. Based on the PDMS-sieve, a rapid, simple and sensitive sorptive extraction method was established for analysis of five pyrethroid residues in tea samples. In the method, pyrethroids in a stirred solution were extracted on a PDMS-sieve, the analytes loaded on the sieve were then ultrasonically desorbed in ethyl acetate and analyzed by gas chromatography-mass spectrometer (GC-MS) with selected ion monitoring mode (SIM). The proposed method was optimized and validated, the matrix-matched calibration curves were performed at six concentration levels and good linear correlations (r) were obtained (r ≥ 0.9907) within the range of 0.001–0.1 μg mL−1. The detection limits (LODs) of five pesticides ranged from 0.8 ng g−1 to 19.6 ng g−1. Good repeatability was obtained with the inter- and intra-day relative standard deviation (RSDs) values lower than 10%. The method has been applied successfully to the determination of pyrethroids in six tea samples, and satisfactory recoveries ranging from 82% to 111% were obtained. The results indicated that the proposed method is suitable for trace analysis of pesticides residues in tea samples.

Graphical abstract: New sorptive extraction method based on polydimethylsiloxane sieve combined with GC-MS for determination of pyrethroid residues in tea

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Article information


Submitted
17 Aug 2012
Accepted
12 Oct 2012
First published
02 Nov 2012

Anal. Methods, 2012,4, 4161-4167
Article type
Paper

New sorptive extraction method based on polydimethylsiloxane sieve combined with GC-MS for determination of pyrethroid residues in tea

H. Xu, X. Sun and D. Song, Anal. Methods, 2012, 4, 4161
DOI: 10.1039/C2AY25918D

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