Abstract: The present invention is directed to a system for pre-treatment of a sample to be introduced in a chromatograph, and a method for performing solid-phase extraction of a component present in a sample. The system uses a syringe having a needle being provided with a porous body having a monolithic structure along at least an appropriate length of the needle and across an overall diameter of the needle. The method includes the steps of inserting the needle into the sample, passing the sample through the needle to retain an analyte within the porous body, and desorbtion of the retained analyte from the porous body.

Abstract: The invention relates to a method of trace analysis of organic compounds which calls for the steps of setting a test piece in a flow cell, and thereafter removing organic compounds from the test piece by heating it at high temperature in an oven. The compounds are concentrated in a trap tube and then removed from the trap tube and carried into a concentrating/inlet unit, such as a thermal desorption cold trap injector. In this unit, cryofocusing of the compounds is performed, and then the organic compounds are introduced into a gas chromatograph to be analyzed therein, wherein a part of the purified inert gas is caused, except during the process of trapping the organic compounds, to flow into the flow cell from the direction opposite the direction from which the gas flows along the trapping line.

Abstract: In a gas scavenging unit for gas chromatography analysis of gas generated in a thermal analyzer, the thermal analyser is equipped with a gas scavenging unit for scavenging gas generated in the thermal analyzer without usage of a carrier gas and no influence of a switching valve exists in the case of multi-stage sampling. For scavenging, there can be provided multiple sampling flow paths each have an aperture placed between the sample and the carrier gas outlet of the thermal analyzer, a flow regulator, a flow path switching valve, and a suction unit which is connected to the switching valve. The gas generated in the thermal analyzer is suctioned by the suction unit through a sampling flow path which is changed with the flow path switching valve. The appropriate volume of gas is scavenged to the GC analysis without any influence of the flow (rate) of the carrier gas even when the scavenging is done through switching to multiple scavengers.