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Pesticide trace analysis using solid-phase extraction and gas chromatography with electron-capture and tandem mass
J L Martínez Vidal1, M C Espada, A G Frenich
1Department of Analytical Chemistry, Faculty of Experimental Sciences, University of Almería, Spain. jlmartin@ualm.es
Abstract:
Gas chromatography (GC) with electron-capture detection (ECD), mass spectrometry (MS) and tandem mass spectrometry (MS-MS) were employed for the identification of 12 pesticides in water samples. For this purpose, a solid-phase extraction procedure with C18 cartridges was used, optimising the breakthrough volume and the saturation concentration. In GC-MS-MS, the lowest detectable concentrations for the pesticides were between 2 and 26 ng l(-1), recoveries ranged from 70 to 133% in water samples spiked at 100 ng l(-1) and the relative standard deviations were in the range 5.3 to 17.4%. The proposed analytical methodology was applied to analyse pesticides in wetland samples from Almería (Spain).