Variable flow capillary gas chromatography method
First Claim
1. A method for temperature programmed capillary column gas chromatography, comprising the steps of:
- flowing a carrier gas through a gas chromatography injection port with essentially all of the carrier gas subsequently flowing into a gas chromatography capillary column at a first flow rate and a first pressure;
heating the column to a first temperature;
introducing a sample through the injection port, the sample comprising a solvent and a component of interest;
reducing the flow rate of the carrier gas to a second flow rate at a time longer than immediately after beginning the step of introducing the sample, the second flow rate being a normal flow rate for the column; and
increasing the temperature of the column so that the component of interest emerges from the column.
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Abstract
A method for temperature programmed capillary column gas chromatography characterized in that carrier gas is flowed in an amount greater than that under normal separation conditions for a term starting from before injection of a sample or immediately after the injection and ending at any time point from immediately after a solvent in the sample commences to enter into a column to the solvent finishing passing through the column. The invention is also apparatus for the above method characterized in that the apparatus has two flow paths for carrier gas which, for example, join to one flow path before a sample injection device, and one of the flow paths has a valve which can rapidly stop or decrease the flow of the carrier gas in that flow path.
29 Citations
7 Claims
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1. A method for temperature programmed capillary column gas chromatography, comprising the steps of:
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flowing a carrier gas through a gas chromatography injection port with essentially all of the carrier gas subsequently flowing into a gas chromatography capillary column at a first flow rate and a first pressure; heating the column to a first temperature; introducing a sample through the injection port, the sample comprising a solvent and a component of interest; reducing the flow rate of the carrier gas to a second flow rate at a time longer than immediately after beginning the step of introducing the sample, the second flow rate being a normal flow rate for the column; and increasing the temperature of the column so that the component of interest emerges from the column. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification