Determination of some selected pesticide residues in apple juice by solid-phase microextraction coupled to gas chromatography - mass spectrometry
2011
Hercegova, A.,Slovenska Technicka Univ., Bratislava (Slovak Republic). Ustav Analytickej Chemie | Moeder, M.,Umweltforschungszentrum Leipzig-Halle, Leipzig (Germany)
The performance of solid phase microextraction (SPME) for enrichment of pesticides from apple juice was investigated. Samples were diluted with water, extracted by solid-phase microextraction and analysed by gas chromatography using mass-spectrometry detector in selected ion monitoring mode. The method was tested for the following pesticides: tebuthylazine, fenitrothion, chlorpyrifos, myclobutanil, cyprodinil, phosalone, pyrimethanil, tebuconazole, kresoxim-methyl, methidathion, penconazole. All pesticides were extracted with polydimethylsiloxane fibre (100 microm thickness). The linear concentration range of application was 0.05 microg/cubic dm - 10 microg/cubic dm. The method described provides detectabilities complying with the maximum residue levels set by regulatory organizations for pesticides in apple juice matrices. The solvent-free SPME procedure was found to be quicker and more cost effective than the solvent extraction methods commonly used.
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