Method and apparatus in gas chromatography for introducing a sample
First Claim
1. A method of introducing into a capillary column of a gas chromatograph a sample, which contains target components to be analyzed and a solvent and is injected into a vaporization chamber at the inlet of said column, by causing a carrier gas to flow into said vaporization chamber and to carry said injected sample into said column, said method comprising the steps of:
- temporarily increasing the pressure of said carrier gas flowing into said vaporization chamber as said sample is injected;
causing said carrier gas to introduce said sample through a tubular insert which is inserted into said vaporization chamber and has an internal volume so determined that the retention time of said carrier gas through said insert is less than 4 seconds; and
controlling the temperature inside said vaporization chamber to remain within a specified range above the boiling point of said solvent as said sample is injected into said vaporization chamber and thereafter raising the temperature inside said vaporization chamber.
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Accused Products
Abstract
A tubular insert with a small internal volume is disposed inside the vaporization chamber at the inlet of a capillary column of a gas chromatograph such that the sample with a solvent injected into the vaporization chamber is carried by a carrier gas through the insert into the column. The internal volume of the insert is such that the retention time of the carrier gas through the insert is less than 4 seconds. A heater is controlled to maintain the temperature inside the vaporization chamber within a specified range above the boiling point of the solvent as the sample is injected into the vaporization chamber, and this temperature is subsequently raised to a final temperature above the boiling points of the components to be analyzed. The carrier gas pressure is temporarily increased for better efficiency as the sample is injected.
23 Citations
18 Claims
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1. A method of introducing into a capillary column of a gas chromatograph a sample, which contains target components to be analyzed and a solvent and is injected into a vaporization chamber at the inlet of said column, by causing a carrier gas to flow into said vaporization chamber and to carry said injected sample into said column, said method comprising the steps of:
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temporarily increasing the pressure of said carrier gas flowing into said vaporization chamber as said sample is injected; causing said carrier gas to introduce said sample through a tubular insert which is inserted into said vaporization chamber and has an internal volume so determined that the retention time of said carrier gas through said insert is less than 4 seconds; and controlling the temperature inside said vaporization chamber to remain within a specified range above the boiling point of said solvent as said sample is injected into said vaporization chamber and thereafter raising the temperature inside said vaporization chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for supplying a carrier gas into a vaporization chamber at an inlet of a capillary column of a gas chromatograph for introducing into said column a sample which contains target components to be analyzed and a solvent and is injected into said vaporization chamber, said apparatus comprising:
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a tubular insert disposed inside said vaporization chamber for causing said carrier gas and said sample to pass therethrough into said column, said insert having an internal volume such that the retention time of said carrier gas through said insert is less than 4 seconds; a pressure control means for controlling the pressure of said carrier gas entering said vaporization chamber, said pressure control means temporarily increasing the pressure of said carrier gas flowing into said vaporization chamber as said sample is injected; and a heater which is controlled to maintain the temperature inside said vaporization chamber within a specified range above the boiling point of said solvent as said sample is injected into said vaporization chamber and to thereafter raise the temperature inside said vaporization chamber. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification