Two-dimensional capillary gas chromatography with three selective detectors as a valuable tool in residue analysis — state-of-the art

Summary

A method for pesticide residue analysis applying the technique of two-dimensional gas chromatography with effluent splitting to three selective detectors in parallel is described. Screening and confirmation procedures are combined in one single instrument. The column combination used allows the separation and identification of more than three hundred pesticides on the basis of the resulting retention times and detector signals. Critical pairs of pesticides are distinguished by using the response ratio of the selective detectors characteristic for each substance. An example is given to demonstrate the merits of the described GC-system using the multimethod S19 of the DFG Pesticide Commission for clean-up.