title: [Detection of organophosphorous pesticide residues in food at the ppb level with open tubular column gas chromatograph-mass spectrometry (author's transl)].
abstract: The application of the combination open tubular column gas chromatography-mass spectrometry-computer for the detection and identification of organophosphorous pesticide residues in food was demonstrated. 23 of the most frequently used organophosphorous pesticides in Germany were separated on a 20 m SE-54 glas capillary column with the exception of the pair phosphamidone/fenchlorphos. Detection and identification of the individual pesticides were performed by chemical ionization mass spectrometry (CI) with isobutane and computerized background subtraction. In an example 10 of these substances were detected in cherries at a residue level of 0.45 ppm by comparison of CI mass spectra.--Mass fragmentography with single and multiple ion detection allowed the unequivocal identification of these 10 pesticides at the 40 ppb level in cherries. The detection limit of the pesticides examined in this study was found in the lower ppb region in food extracts using CI with isobutane. The application of an integrated computer system allowed the determination of all 10 pesticides in a single gc run.--Comparing electron impact and chemical ionization with isobutane in mass fragmentography of organophosphorous pesticide residues in food a considerable lower detection limit was observed using the chemical ionization procedure.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods; D005504:Food Analysis / Q000379:methods; D007306:Insecticides / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods; D008832:Microchemistry; D009943:Organophosphorus Compounds
chemical_list: D007306:Insecticides; D009943:Organophosphorus Compounds
vernacular_title: Nachweis von Organophosphorsäureester-Rückständen in Lebensmitteln im PPB-Bereich durch Capillargaschromatographie-Massenspektrometrie-Kopplung.