Development of an SPME-GC-MS/MS method for the determination of pesticides in rainwater: laboratory and field experiments |
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Authors: | Sauret-Szczepanski Nathalie Mirabel Philippe Wortham Henri |
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Affiliation: | Equipe de Physico-chimie de l'Atmosphere, Centre de Géochimie de la Surface, UMR 7517, 1, rue Blessig, 67084 Strasbourg Cedex, France. |
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Abstract: | A solid-phase microextraction -- coupled to a gas chromatography -- ion trap tandem mass spectrometry (SPME-GC-MS/MS) method was developed for the quantitative determination in rainwater of 8 pesticides amongst the most used in France and 3 triazines metabolites. The main factors affecting the SPME process were studied. Using a 3 mL sample, the method developed showed good linearity for concentrations ranging from 0.05 to 50 microgL(-1) with correlation coefficients between 0.997 and 0.9999 and relative standard deviations (% RSD) below 14%. The study of matrix effects showed that rainwater was too diluted to have any significant influence on the extraction efficiency. To validate the method, a field campaign was carried out on the rain events, which occurred in Strasbourg during a one-year period. The rain concentrations showed patterns of high pesticide concentrations during spring months, which were correlated to the spraying periods of most of these substances. |
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