Tandem capillary gas chromatography in pesticide residue analysis.

Maximum residue levels of pesticides in food and feed are often below the 0.1 ppm level. On capillary columns, the maximum injection volumes are 5-10 microliters in the splitless mode, although of course some (acceptable) overloading of the GC column occurs.

Determination of individual chlorinated biphenyls in agricultural products by automated capillary gas chromatography: determination in cattle feed and its relation to milk residues.

Polychlorinated biphenyls were determined by glass capillary gas chromatography with electron capture detection, with automatic splitless injection. Using a saponification step as clean-up procedure, the detection limit for individual polychlorinated biphenyls can be improved up to the sub-ppb level for vegetable material and up to the ppb level for fatty material. Quantification is carried out by comparison of separated chlorobiphenyl peaks with the corresponding individual chlorobiphenyl standards.