US 7,363,801 B2 | ||
Gas chromatograph sample injector | ||
Hitoshi Tsuchihashi, Osaka (Japan); Akihiro Miki, Kyoto (Japan); Munehiro Katagi, Osaka (Japan); Mayumi Nishikawa, Osaka (Japan); and Kei Zaitsu, Nara (Japan) | ||
Assigned to Shimadzu Corporation, Kyoto (Japan) | ||
Filed on Dec. 20, 2005, as Appl. No. 11/311,263. | ||
Claims priority of application No. 2005-299479 (JP), filed on Oct. 14, 2005. | ||
Prior Publication US 2007/0084302 A1, Apr. 19, 2007 | ||
Int. Cl. G01N 30/02 (2006.01) |
U.S. Cl. 73—23.41 [422/89] | 6 Claims |
1. A sample injector for injecting a liquid sample into a sample-vaporizing chamber located at an inlet of a column of a gas
chromatograph, which is used to analyze a sample that needs to undergo a derivation process before an analysis, the sample
injector comprising:
a) a liquid-holding device having a syringe with a needle attached to its tip and a plunger slidably inserted into the syringe;
b) an actuator for activating the plunger; and
c) a controller for controlling the actuator to push or pull the plunger so that:
a derivation reagent is suctioned into the syringe, whereafter a sample to be analyzed is suctioned so that the sample is
held closer to the needle and the derivation reagent farther from the needle;
the needle is inserted into the sample-vaporizing chamber; and
the plunger is pushed into the syringe in a manner so that the sample held in the syringe is first injected into the sample-vaporizing
chamber, and then the derivation reagent held in the syringe is injected into the sample-vaporizing chamber when a predetermined
period of time has elapsed after the injection of the sample into the sample-vaporizing chamber.
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