A solid phase microextraction (SPME) method for simultaneous determination of 20 pesticides belonging to various pesticide groups in soil samples was developed. Extraction conditions, such as fibre type, desorption temperature and time, extraction time and NaCl content were investigated. Detection and quantification were done by gas chromatography-mass spectrometry (GC-MS). The results indicate that most of the studied pesticides were more strongly sorbed by soil that has higher organic matter and/or clay content. Relative standard deviation (RSD) values for multiple analysis of soil samples fortified at 30 µg kg-1 of each pesticide were below 19%. Limits of detection (LOD) for all the compounds studied were less than 5 µg kg-1.
solid phase microextraction; pesticides; soil; multiresidue method
