GAS-CHROMATOGRAPHY WITH ELECTRON-CAPTURE AND NITROGEN-PHOSPHORUS DETECTION IN THE ANALYSIS OF PESTICIDES IN HONEY AFTER ELUTION FROM A FLORISIL COLUMN - INFLUENCE OF THE HONEY MATRIX ON THE QUANTITATIVE RESULTS

A modified procedure to extract pesticides from honey samples that inv olves loading the honey onto a Florisil packed column and subsequently eluting it with an n-hexane-dichloromethane mixture is proposed. Anom alous high gas chromatographic responses and subsequently very high re coveries for the pesticides in the extracts were obtained by a convent ional calibration with pesticide solutions in organic solvent. This ef fect was attributed to the honey matrix and can be circumvented by usi ng spiked honey extracts as calibration standards. (C) 1998 Elsevier S cience B.V. All rights reserved.