Measuring and testing – Gas analysis – Gas chromatography
Patent
1998-10-29
2000-10-17
Larkin, Daniel S.
Measuring and testing
Gas analysis
Gas chromatography
73 2335, 95 87, 96103, G01N 3002
Patent
active
061314404
ABSTRACT:
A flow of a carrier gas through a column is provided. A sample is provided in the column, and a temperature of a longitudinally short portion of the column is raised to a predetermined controlled high temperature at which volatile substances are released from the sample packing and are carried by the carrier gas. The column is cooled on each side of the short portion to a low temperature at which the volatile substances condense or adsorb on the column packing. By continuously moving the heated short portion from an inlet end to an outlet end of the packing in a direction of carrier gas flow the volatile substances selected by the controlled high temperature are released. Four particularly useful and advantageous applications can be identified for the invention. Firstly, it provides an improved gas chromatograph (GC) injector. Secondly, it provides an improved thermal separator or extractor. Thirdly, it provides an efficient way to analyze target compounds suspected of being contained within a complex mixture by allowing for the GC analysis to be carried out only on those compounds or substances falling within the same or similar thermal desorption characteristics as those of the target compound. Lastly, by operating in a full time-coupled time-resolved (TCRC) mode, a complete three-dimensional analysis output can be obtained giving better power of separation of the analyzed sample, which is of particular importance when the substance to be analyzed is a complex organic material.
REFERENCES:
Fuggerth, "Zone Gas Chromatography", Analytical Chemistry, vol. 61, No. 14 pp. 1478-1485, Jul. 1989.
Anglehart James
Larkin Daniel S.
Universite de Montreal
LandOfFree
Selective removal of volatile substances injected into a chromat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Selective removal of volatile substances injected into a chromat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Selective removal of volatile substances injected into a chromat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-458030