Patent ID: 6652625
Filing Date: 2003-11-25
Classification: G01N

Abstract:
A method of pre-concentrating analytes in a gas chromatographic system including a chromatographic column coupled to a chromatographic injector, which injector has a main carrier gas inlet, the pressure of which can be regulated, an auxiliary carrier gas inlet, the pressure of which can be regulated, a liner, which liner has an inlet and an outlet, wherein the inner diameter of the outlet is smaller than the inner diameter of the inlet, and an adsorbent disposed inside the liner, said method comprising the steps of:opening the vent and setting the pressures of the main carrier gas inlet and the auxiliary carrier gas inlet such that the column is isolated from substances flowing through the liner; introducing a sample mixture into the injector, such that the mixture flows into the liner, passes through the adsorbent, which adsorbs the analytes, and is vented from the injector; closing the vent and setting the pressures of the main carrier gas inlet and the auxiliary carrier gas inlet such that the column is no longer isolated from substances flowing through the injector; and desorbing the analytes adsorbed by the adsorbent into the column.