Measuring and testing – Gas analysis – Gas chromatography
Patent
1998-05-18
2000-05-16
Larkin, Daniel S.
Measuring and testing
Gas analysis
Gas chromatography
73 2335, 96101, 96105, G01N 3004
Patent
active
06062065&
ABSTRACT:
A tubular insert with a small internal volume is disposed inside the vaporization chamber at the inlet of a capillary column of a gas chromatograph such that the sample with a solvent injected into the vaporization chamber is carried by a carrier gas through the insert into the column. The internal volume of the insert is such that the retention time of the carrier gas through the insert is less than 4 seconds. A heater is controlled to maintain the temperature inside the vaporization chamber within a specified range above the boiling point of the solvent as the sample is injected into the vaporization chamber, and this temperature is subsequently raised to a final temperature above the boiling points of the components to be analyzed. The carrier gas pressure is temporarily increased for better efficiency as the sample is injected.
REFERENCES:
patent: 5339673 (1994-08-01), Nakagawa et al.
patent: 5672810 (1997-09-01), Shibamoto et al.
patent: 5779765 (1998-07-01), Grob et al.
Principles and Practice of Gas Chromatography, Robert L. Pecsok, ed. John Wiley and Sons, Inc., 1959, pp. 40-47.
Miyagawa Haruhiko
Nakagawa Katsuhiro
Sugimoto Kiyoshi
Larkin Daniel S.
Osaka Pharmaceutical Association
Shimadzu Corporation
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