Method for applying samples to be analyzed by gas chromatography and sampling tube
US6134945A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1999 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Aug 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N30/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method for applying samples to be analyzed by gas chromatography using a sampling tube, which has a section which contains the adsorbing agent and narrows essentially conically towards a bore which is free of adsorbing agent and has a reduced diameter, in such a manner that the flow rate of a gas which is guided through towards the narrowed section on the outlet side is at least approximately equal to the inlet-side flow rate, liquid or gaseous starting sample material being guided through the sampling tube towards the narrowed section, so that substances to be analyzed are adsorbed on the adsorbing agent, the sampling tube being flushed with drying gas, which is guided through the sampling tube in the same direction as the starting sample material, until the liquid phase, which is contained in the sampling tube, or the starting sample material is essentially removed, and the adsorbed sample being desorbed by means of a carrier gas which is introduced through the sampling tube from the narrowed side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.