Herein is disclosed an inlet liner for use within an injection port of a capillary gas chromatograph. The inlet liner can include a first fused quartz tube and a second fused quartz tube aligned along a common longitudinal axis; the outside surface of the first fused quartz tube affixed to the inside surface of the second fused quartz tube. In certain instances, the tubers are affixed at two points along the longitudinal axis thereby defining a hermetically sealed volume between the outside surface of the first quartz tube and the inside surface of the second fused quartz tube, wherein the hermetically sealed volume entrains a reactive surface.
