Shimadzu Corporation

Munehiro Katagi

Kei Zaitsu

Hitoshi Tsuchihashi

Mayumi Nishikawa

Akihiro Miki

In a sample injector for a gas chromatograph, the present invention improves the throughput of a GC analysis including the derivation of a target compound and reduces the tedious work of handling a reagent for the derivation. According to the present invention, a derivation reagent R is suctioned into a microsyringe, after which a small amount of air and a sample P to be analyzed are successively suctioned so that the reagent, the air and the sample are held in this order, from top to bottom. Then, the needleof the microsyringeis inserted through the septuminto the sample-vaporizing chamber, and the plungeris pushed halfway through so that only the sample is injected into the sample-vaporizing chamber. The sample thus injected is quickly vaporized into a gas sample and introduced into the column, where the target compound contained in the gas sample adheres to the inner wall of an inlet section of the column. When several seconds have passed after the injection of the sample, the plungeris further pushed down to inject the reagent into the sample-vaporizing chamber. Then, the reagent is turned into gas and introduced into the column, where the reagent reacts with the compound to produce a derivative. Subsequently, the temperature of the columnis raised to carry out a GC analysis.

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Osaka, Japan

Munehiro Katagi