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Quantitative Chemometrics Using Refractive Index Spectra.

Thomas G Mayerhöfer1,2, Oleksii Ilchenko3,4, Andrii Kutsyk4

  • 1Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07745 Jena, Germany.

Applied Spectroscopy
|June 26, 2025
PubMed
Summary
This summary is machine-generated.

Quantitative chemometrics using refractive index spectra offers superior performance over traditional absorbance spectra. Refractive index integrates spectral information, improving accuracy, especially in non-absorbing regions for chemical analysis.

Keywords:
Ideal binary liquid mixturesclassical least squares regressionrefractive index spectra

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Chemometrics

Background:

  • Quantitative chemometrics traditionally relies on absorbance spectra for chemical analysis.
  • Absorbance is linked to the absorption index, a key optical property.
  • Extending chemometric methods to refractive index spectra is a logical progression.

Purpose of the Study:

  • To investigate the performance of classical quantitative chemometrics using refractive index spectra compared to absorbance spectra.
  • To evaluate the advantages of refractive index spectra in chemical composition analysis.

Main Methods:

  • Correction of absorbance spectra to derive refractive index spectra, ensuring wave optics compliance.
  • Application of classical quantitative chemometric methods to both refractive and absorption index spectra.
  • Analysis of a binary system (benzene and toluene) as a model.

Main Results:

  • Classical quantitative chemometrics performed better using refractive index spectra than absorbance spectra in the benzene-toluene system.
  • Refractive index spectra provide compositional information even in non-absorbing spectral regions.
  • The refractive index integrates absorptive changes at higher wavenumbers, enhancing its utility.

Conclusions:

  • Refractive index spectra offer a more robust foundation for quantitative chemometrics compared to absorbance spectra.
  • The integration property of refractive index spectra provides a significant advantage for chemical analysis, particularly in regions lacking absorption.