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Issue 10, 2003
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Analysis of pesticide residues in lettuce by large volume–difficult matrix introduction–gas chromatography–time of flight–mass spectrometry (LV-DMI-GC-TOF-MS)

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Abstract

A multi-residue method is described that eliminates the need for a clean-up step and thus allows the rapid determination of pesticides in crude extracts of lettuce. Samples were extracted with a mixture of ethyl acetate, Na2SO4 and NaHCO3 and the crude extracts analysed directly using large volume–difficult matrix introduction (LV-DMI) in combination with gas chromatography–time of flight–mass spectrometry (GC-TOF-MS). The LV-DMI procedure described was evaluated for the analysis of dimethoate, pyrimethanil, chlorothalonil, vinclozolin, furalaxyl and oxadixyl. Satisfactory response was obtained at the lowest calibrated level (LCL) of 0.0025 µg ml−1, with good linearity over the range 0.0025–0.5 µg ml−1 (0.005–1.0 mg kg−1 equivalent). Average recoveries between 73 and 118% were obtained at the 0.01–0.5 mg kg−1 levels with RSD values ≤13%.

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Publication details

The article was received on 09 Jun 2003, accepted on 03 Sep 2003 and first published on 15 Sep 2003


Article type: Paper
DOI: 10.1039/B306482D
Citation: Analyst, 2003,128, 1228-1231

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    Analysis of pesticide residues in lettuce by large volume–difficult matrix introduction–gas chromatography–time of flight–mass spectrometry (LV-DMI-GC-TOF-MS)

    K. Patel, R. J. Fussell, D. M. Goodall and B. J. Keely, Analyst, 2003, 128, 1228
    DOI: 10.1039/B306482D

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