Gas chromatograph mass spectrometer

An interface placed between a gas chromatograph part and a mass spectrometer part of a gas chromatograph mass spectrometer (GC/MS) for allowing a column or a plurality of columns to pass air-tightly from the gas chromatograph part to the mass spectrometer part, the interface comprising:

• a heat-retention block having a small-diameter hole for allowing the plurality of columns to pass therethrough;
• a single-hole ferrule having a small-diameter hole for allowing a single column to pass therethrough;
• a plural-hole ferrule having a plurality of small-diameter holes for allowing the plurality of columns to respectively pass therethrough;
• an adapter placed between the heat-retention block and the below-described plural-column nut, and including a long large-diameter opening for allowing the plurality of columns passing through the plural-hole ferrule to converge on the small-diameter hole of the heat-retention block without excessively bending the plurality of columns;
• a single-column nut for pressing the single-hole ferrule to the heat-retention block;
• and
• a plural-column nut for pressing the plural-hole ferrule to the adapter.