Residue analysis of organophosphorus pesticides in food with two‐dimensional gas chromatography using capillary columns and flame photometric detection

Abstract

Abstract Two‐dimensional gas chromatography with two capillary columns of different polarity (SP 2100 and OV 225) is used for pesticide residue analysis in food samples. By means of “live chromatography” applying pneumatic switching technique according to Deans, unequivocal identification of 57 organophosphorus pesticides in food samples is achieved at trace concentrations. The instrument is equipped with only one injection port and one flame photometric detector. On‐line data processing is very helpful, especially in calibration and checking the system's reliability with the multitude of test compounds. The complete pesticide residue analysis including clean‐up of about six food samples can be completed by one person in 8 hours.