Otsuka Pharmaceutical Company, Limited

Takashi Maruyama

Masaaki Mori

Yasuhiro Kubo

Tamotsu Hamao

Kazunori Tsutsui

Katsuhiro Morisawa

Yasushi Zasu

Eiji Ikegami

A correction curve (FIG.,) is prepared by plotting,CO,concentrations and,CO,/,CO,concentration ratios which are determined on the basis of a calibration curve and,CO,and,CO,absorbances of gaseous samples having the same,CO,/,CO,concentration ratio but known different,CO,concentrations. A gaseous test sample containing,CO,and,CO,as component gases is introduced into a cell, and spectrometrically measured. A,CO,concentration of the gaseous test sample is determined by way of the spectrometric measurement. A concentration ratio correction value is obtained on the basis of the correction curve and the,CO,concentration of the gaseous test sample thus determined. A measured,CO,/,CO,concentration ratio is divided by the concentration ratio correction value thus obtained for correction of the,CO,/,CO,concentration ratio. Thus, the measurement accuracy of the concentration ratios of the component gases can be improved.

Method for spectrometrically measuring isotopic gas and apparatus thereof

Apparatus and breathing bag for spectrometrically measuring isotopic gas

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Osaka, Japan

Takashi Maruyama