Adjustable open-split interface for a gas chromatograph and a mass spectrometer

摘要

An apparatus and a method providing an open-split interface between a gas chromatograph and a mass spectrometer for delivering a substantially solvent free sample material from the gas chromatograph to the mass spectrometer. The apparatus has a junction having an inlet to receive a gas chromatograph effluent. An inert auxiliary fluid such as helium supplied through a port is used to scavenge the solvent rich effluent to atmosphere. A transfer member disposed partially within the junction is initially positioned at a first position to accomplish the aforementioned scavenging action. The transfer member is then repositioned to a second position to direct the substantially solvent free sample to the mass spectrometer for a qualitative and a quantitative analysis.