| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method that accurately quantifies a density by measuring an infrared absorption spectrum under a condition suitable for each component substance, when quantifying a density of each component substance included in a multi-component mixed solution containing a plurality of components from a measurement result of the infrared absorption spectrum.SOLUTION: When measuring densities of known substances in a solution in which one or more kinds of the known substances is contained and two or more characteristic absorption bands originating from the known substances exist from the infrared ray absorbance information, a chemometric method is applied to second-order spectrum information prepared from infrared ray absorption spectra measured under conditions suitable for the known substances, respectively, in order to obtain calibration curves. The densities of the known substances are calculated by using the calibration curves, respectively.</p> |
