Journal
ANALYTICA CHIMICA ACTA
Volume 688, Issue 2, Pages 191-196Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2010.12.037
Keywords
Infrared spectroscopy; Preconcentration; Liquid phase microextraction; Vapour phase generation; Dithiocarbamates
Categories
Funding
- Ministerio de Educacion y Ciencia [CTQ2008-05719/BQU]
- Conselleria diEducacio de la Generalitat Valenciana [PROMETEO 2010-055]
- Ministerio de Ciencia e Innovacion of the Spanish government [AP2007-04566]
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A methodology based on the vapour phase (VP) generation of carbon disulphide from non-volatile dithiocarbamate compounds has been developed for determination of pesticide residues in foodstuff at low ppm levels. The method involves a selective reaction combined with liquid phase microextraction (LPME) and transmission infrared measurements. The use of a home made transmission cell improved the detection limits (LOD) compared to the use of attenuated total reflectance measurements by a factor of approximately 80. Using the most appropriate experimental conditions for the CS2 generation and LPME preconcentration, the precision of the methodology, expressed as the relative standard deviation (RSD), was of the order of 3.1% and the absolute LOD was 0.3 mu g dithiocarbamate, which corresponds to 60-120 mu g kg(-1), for a sample mass ranging from 2.5 to 5g. The usefulness of the methodology has been evidenced by the determination of mancozeb residues in strawberries, lettuce and corn samples at concentrations between 1 and 5 mg kg(-1), where the VP-LPME IR provided results comparable with those obtained by a head space gas chromatography mass spectrometry reference procedure. (C) 2011 Elsevier B.V. All rights reserved.
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