G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 1/22 (2006.01) G01N 21/25 (2006.01) G01N 21/59 (2006.01) G01N 33/497 (2006.01) G01N 35/08 (2006.01)
Patent
CA 2402305
A correction curve is prepared by plotting 12CO2 concentrations and 13CO2/12CO2 concentration ratios which are determined on the basis of a calibration curve and 13CO2 and 12CO2 absorbances of gaseous samples having the same 13CO2/12CO2 concentration ratio but known different 12CO2 concentrations. A gaseous test ample containing 13CO2 and 12CO2 as component gases is introduced into a cell, and spectrometrically measured. A 12CO2 concentration of the gaseous test sample is determined by pay of the spectrometric measurement. A concentration ratio correction value is obtained on the basis of the correction curve and the 12CO2 concentration of the gaseous test sample thus determined. A measured 13CO2/12CO2 concentration ratio is divided by the concentration ratio correction value thus obtained for correction of the 13CO2/12CO2 concentration ratio. Thus, the measurement accuracy of the concentration ratios of the component gases can be improved.
Hamao Tamotsu
Ikegami Eiji
Kubo Yasuhiro
Maruyama Takashi
Mori Masaaki
Otsuka Pharmaceutical Co. Ltd.
Riches Mckenzie & Herbert Llp
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