Solid-phase extraction for replacing dichloromethane partitioning in pesticide multiresidue analysis |
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Authors: | Karen Nordmeyer and H-P Thier |
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Affiliation: | (1) Institute of Food Chemistry, University of Münster, Corrensstrasse 45, D-48149 Münster, Germany, DE |
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Abstract: | The Deutsche Forschungsgemeinschaft S 19 method is widely used for pesticide multiresidue analysis in crops. It includes
a liquid-liquid partition step with dichloromethane, which is undesirable for toxicological and ecological reasons. Therefore,
this step was replaced by a solid-phase extraction (SPE) of the diluted acetone extract with a mixture of RP-18-PolarPlus
and cyano material, which was afterwards eluted with ethyl acetate. Using this novel approach for extraction, concentration
and clean-up, the recovery rates from fruits and vegetables fortified with 0.12–0.48 mg/kg of 31 pesticides with different
chemical structures and polarities averaged 80% in most cases, except for some extremely polar compounds. The variation coefficients
observed were near 5%. Compared to the partitioning step used hitherto, even higher recoveries were obtained by SPE for non-polar
and medium-polar pesticides. In addition, the gas chromatograms often showed fewer interfering peaks from plant coextractives.
Received: 20 July 1998 |
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Keywords: | Residue analysis Pesticides Fruits and vegetables Plant material Solid-phase extraction |
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