Method and Apparatus for concentrating a gaseous substance

摘要

A method of concentrating a gaseous substance, the method comprising the steps of: isolating a trap in which an analyte to be concentrated has been absorbed from a carrier gas passed through the trap; reducing the pressure within the trap to a first pressure desorbing the analyte from the trap; and diffusing the analyte released from the trap into an analyser operating at a second pressure lower than the first pressure. <IMAGE>