Gas chromatograph apparatus for a liquid sample containing a solvent

A gas chromatograph for analyzing a target component in a liquid sample also containing a solvent;

• said apparatus comprising:
• a sample injection port containing a pre-column filled with a packing material capable of holding said liquid sample injected into said pre-column, and having a carrier gas inlet, a split discharge outlet and a column-connecting opening connected to a column;
• temperature control means for controlling temperature of said sample injection port;
• split ratio control means for controlling the split ratio defined as the ratio between gas flow rates through said column-connecting opening into said column and through said split discharge outlet out of said sample injection port;
• and
• vaporization control means for controlling said temperature control means and said split control means in coordination with each other according to the boiling point of said target component and the boiling point of said solvent;
• wherein said vaporization control means causes said temperature control means to keep the temperature of said sample injection port below the boiling point of said solvent before said sample is injected into said pre-column, causes said split ratio control means to keep the split ratio at a large value and said temperature control means to raise the temperature of said sample vaporization above the boiling point of said solvent after said sample is injected into said pre-column so as to cause a large portion of said solvent to be discharged from said sample injection port mostly through said split vent, and causes said split ratio control means to reduce the split ratio to a smaller value than said large value and said temperature control means to raise the temperature of said sample injection port above the boiling point of said target component after a specified length of time depending on the amount of said sample which was injected.