Gas chromatograph analysis method and gas chromatograph analysis program

A non-transitory computer-readable recording medium containing a gas chromatograph analysis program for controlling a system including a headspace sampler and a measurement unit configured to detect a component contained in a sample gas by separating the component in a gas chromatograph column, the gas chromatograph analysis program causing a computer to execute:

• a reference compound measurement condition setting step of displaying, upon receiving an operation by a user, an image on a screen for allowing a setting of a measurement condition including a vial oven temperature for measuring n-alkane, which is a reference compound of a retention index, and receiving the setting by the user on the screen;
• a reference compound measurement step of controlling the headspace sampler and the measurement unit according to the setting of the measurement condition set in the reference compound measurement condition setting step to perform gas chromatograph analysis on the n-alkane prepared in a vial;
• and
• a retention time adjustment step of obtaining an actually-measured retention time for the n-alkane on a basis of a chromatogram obtained by the gas chromatograph analysis performed in the reference compound measurement step, estimating a retention time of a compound to be analyzed from the actually-measured retention time and a known retention index of the compound to be analyzed, and adjusting a retention time of the compound in a compound table which describes information on the compound to be analyzed.