Thermo Electron Corporation

Jan Beens

Giacinto Zilioli

A method for detecting substances or mixtures of substances within a sample in an apparatus for comprehensive two-dimensional gas-chromatographic analysis according to the present invention, comprising the steps of: The method moreover envisages the step of generating the first frequency fof modulation and the second frequency fof sampling in such a way that sampling by discrete points downstream of the second column will be in phase with the modulation of the effluents from the first column.

Method and device for comprehensive two-dimensional gas chromatography

This invention relates to a modulator for use in gas chromatographic analysis, adopted for alternatively trapping and releasing fractions of solutes in a length of a capillary column within a chromatographic oven, characterized in that it comprises at least one nozzle placed to spray at least one jet in at least one corresponding place along said capillary column length, said nozzle(s) being connected each to a source of liquid COvia a related valve, and means for alternatively opening said valve(s) for a predetermined time, to cause a jet of liquid COto impinge for said predetermined time on said column place and to leave the oven atmosphere to heat said column place after said predetermined time. The modulator can be used in a conventional GC system or in a two dimensional GC system, for modulating the analytes fed to the second capillary column.

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TA Castricum, Netherlands

Jan Beens