Measuring and testing – Gas analysis – Gas chromatography
Patent
1987-11-03
1988-08-30
Levy, Stewart J.
Measuring and testing
Gas analysis
Gas chromatography
G01N 3038
Patent
active
047667605
ABSTRACT:
A method of chromatographic analysis of mixture of liquid substances in which a sample of the substances is injected to an inlet portion of a chromatographic column wherethrough a flow of carrier gas is conveyed entraining vapors of the substances from the column to a detector. According to one feature of the invention, the flow of carrier gas is divided into two parts; one part of the flow being conveyed at the point of sample injection and during its separation through the column in a direction from the inlet to the outlet, whereas in the detector this part of the flow of carrier gas is conveyed through the column in a direction from the outlet to the inlet. The second part of the flow of carrier gas is continuously passed through the detector. A gas chromatograph comprises an injector having a passage for introducing the sample connected to a pipe for feeding a carrier gas, a chromatographic column, a detector, and a means for sealing this passage. The gas chromatograph further comprises an additional pipe for feeding the carrier gas connected to the outlet from the column, a flow restrictor of constant cross-section secured at the outlet from the detector, and a gas pressure regulator arranged in the additional pipe.
REFERENCES:
patent: 3798973 (1974-03-01), Estey
patent: 4269608 (1981-05-01), Sisti et al.
patent: 4414857 (1983-11-01), Brazhnikov et al.
patent: 4442217 (1984-04-01), Deans
Grob, K., Movements of the Sample Plug in the Column Inlet After On-Column Injection in Capillary Gas Chromatography. In J. of Chromat., 283, (1984), pp. 21-35, 1984.
Chizhkov Vitaly P.
Poshemansky Vladimir M.
Skornyakov Eduard P.
Levy Stewart J.
Roskos Joseph W.
Vsesojuzny Nauchno-issledovatelsky i Konstruktorsky istitute
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