CHROMATOGRAPHIC TECHNIQUE AND APPARATUS

摘要

A compact, sensitive, comprehensive two-dimensional gas chromatographic system (10) includes a chromatrographic column (14) having first section (14A) and second section (14B) in series with each other to permit the flow of sample (12) and a carrier (13) through the sections. The retention time of second section (14B) is less than the band resolution time of first section (14A). To control the wave fronts between the sections, first heater (22) and second heater (26) are positioned to heat and drive off sample collected at the outlet of first section (14A) for collection in second section (14B) and to heat sample collected at the inlet of second section (14B) so that first heater (22) rapidly drives off sample for collection in second section (14B) and then second section (14B) rapidly drives off sample in sharp wave front while first section (14A) is accumulating another band of later movement into second section (14B).