Measuring and testing – Gas analysis – Gas chromatography
Patent
1988-12-20
1989-10-10
Williams, Hezron E.
Measuring and testing
Gas analysis
Gas chromatography
422 89, G01N 3108
Patent
active
048723347
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.
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Stevens Timothy S.
The Dow Chemical Company
Williams Hezron E.
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