A cooling-assisted needle trap device for sampling and delivering materials to an analytical device is disclosed. The device includes a needle having a first end and a second end and a side aperture located between the first and second ends. The side aperture provides access to the interior space of the needle. A sorbent is packed within an interior space of the needle between the second end and the side aperture to entrap an analyte within a sample. The cooling-assisted needle trap device also includes a cooling device configured to cool the sorbent.

A primary trap concentrates the sample, followed by forward flushing of retained compounds more volatile than CO.sub.2 to a secondary trap. In some embodiments, prior to CO.sub.2 elution, the primary trap is isolated from the secondary trap and pressure in the primary trap is reduced to sub-atmospheric. At this time, a pressure sensor measures expansion of CO.sub.2 into a vacuum reservoir to determine the amount of CO.sub.2 and CO.sub.2 is removed. Optionally, inert gas is used to eliminate any remaining CO.sub.2, either at positive pressure instead of removing CO.sub.2 under vacuum, or as an optional additional step after removing CO.sub.2 under vacuum. After the CO.sub.2 is removed, the primary trap is heated and backflushed to the secondary trap, which is then preheated and either injected directly to a GCMS, or further condensed using an open tubular focusing trap for even faster injection rates into the GCMS.

A gas chromatograph includes: a gas chromatograph body having an interior space thermally isolated from an outside; at least one sample vaporization unit mounted on an upper portion of the gas chromatograph body, the sample vaporization unit having a housing provided therein with a heating space surrounded by a heater and being configured to vaporize a sample injected into the heating space by heat from the heater and introduce the vaporized sample into the gas chromatograph body; and at least one cooling fan mounted on the gas chromatograph body to correspond to the at least one sample vaporization unit to blow cooling air toward the least one sample vaporization unit. A heat insulating member is interposed between the gas chromatograph body and the at least one cooling fan to thermally isolate the at least one cooling fan from the gas chromatograph body.