Simultaneous monitoring analysis of multicomponent gas in the atmosphere by FTIR using CLS automatic quantitation

Quantitation method with one wavenumber is a quantitation using height and area of one peak. CLS (Classical Least Square) quantitation is one of the multivariate analyses and calculates quantitatively using all spectral data in the varying area depending on concentration. Therefore, it is an efficient quantitation method in case that it is difficult to find a single peak for quantitation because of overlaid spectra of multicomponent, and simultaneous quantitation of multicomponent is required. One of the advantages of CLS quantitation is high accuracy by noise averaging from calculation using all spectral data in the specified spectral range. The analyses of pure compound (spectrum) obtained in least squares are easy, and this spectrum is similar to pure spectrum of multicomponent. Since it is possible to analyze multicomponent simultaneously, utilization as simultaneous monitoring of multicomponent can be done by use of automatic quantitation program.