Journal
JOURNAL OF SEPARATION SCIENCE
Volume 35, Issue 7, Pages 853-860Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201101036
Keywords
Fungicides; Gas chromatography-mass spectrometry; Matrix solid-phase dispersion; Vineyard soil
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Funding
- Spanish Government
- E.U. [CTQ2009-08377]
- FPU
- Isidro Parga Pondal
- Spanish Ministry of Education
- Xunta de Galicia
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A simplified sample preparation method, based on the matrix solid-phase dispersion technique, is proposed for the sensitive determination of 15 organic fungicides in vineyard soils by gas chromatographymass spectrometry (GCMS). Under final working conditions, sieved samples (0.5 g) were blended and dispersed with 2 g of C18 and transferred to a polypropylene syringe containing 1 g of diatomaceous earth. Analytes were recovered using 10 mL of ethyl acetate, this extract was concentrated to 1 mL and fungicides determined by GCMS, without additional cleanup. The method provided recoveries in the range from 74 to 122% for soils with total carbon contents up to 5.5% and it allowed the use of external standard as quantification technique. Inter-day precision, given as relative standard deviations, stayed between 3 and 13%, and the limits of quantification were comprised between 0.6 and 15 ng g(-1). Several fungicides were found in the top layer of vineyard soils with the highest detection frequency and maximum concentration corresponding to iprovalicarb. Some real samples were also submitted to pressurized liquid extraction. Measured concentrations were in excellent agreement with those obtained by matrix solid-phase dispersion, which reinforces the accuracy of the latter methodology.
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