Method and apparatus for gas chromatographic analysis
First Claim
1. In a method of gas chromatographic analysis wherein the improvement comprises providing a separating column comprising one of a capillary column or micropacked column and a detector comprising a thermal conductivity cell, and maintaining the absolute pressure of the gas immediately upstream of the separating column higher than that in the detector by a factor of at least five by providing a constriction after the separating column and before the detector.
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Abstract
An improvement in the resolution, sensitivity of measurement and sensitivity of detection in gas chromatographic analysis using a capillary column or micropacked column as a separating column and a thermal conductivity cell as a detector wherein the pressure in the gas chamber at the beginning of the separating column is higher than in the detector by a factor of at least 5.
17 Citations
10 Claims
- 1. In a method of gas chromatographic analysis wherein the improvement comprises providing a separating column comprising one of a capillary column or micropacked column and a detector comprising a thermal conductivity cell, and maintaining the absolute pressure of the gas immediately upstream of the separating column higher than that in the detector by a factor of at least five by providing a constriction after the separating column and before the detector.
- 6. An apparatus for gas chromatographic analysis, comprising a separating column comprising one of a capillary column or micropacked column, a detector comprising a thermal conductivity cell and means for maintaining the absolute pressure of the gas in the detector lower by a factor of at least five than the absolute pressure of the gas at the outlet of the separating column, comprising a constriction disposed after the separating column and before the detector.
Specification