Abstract

A principal components regression (PCR) is used to construct a calibration matrix for multicomponent spectroscopic analysis which corrects for background absorption due to variable concentrations of unknown species in a sample matrix. Mixed standards are used in the method, and spectra of the pure background components are not needed. The background correction capability of the method is demonstrated with the use of the UV spectra of aqueous standards prepared from cobalt (II) nitrate and nickel (II) nitrate. Known concentrations of chromium (III) nitrate were added to simulate a background which gave rise to relative concentration errors as high as 70% without the background correction capabilities of the method. With the background correction capabilities of the method, the relative concentration errors were reduced to less than one percent. Preliminary results are presented from an application of PCR to determine the concentration of two active ingredients in a pharmaceutical product in the presence of weakly absorbing tablet excipient materials.

Multicomponent analysis using a confocal Raman microscope

Zhengyuan Tang, Sinead J. Barton, Tomas E. Ward, John P. Lowry, Michelle M. Doran, Hugh J. Byrne, and Bryan M. Hennelly
Appl. Opt. 57(22) E118-E130 (2018)

Analysis of spectroscopic measurements of leaf water content at terahertz frequencies using linear transforms

Sillas Hadjiloucas, Roberto K. H. Galvão, and John W. Bowen
J. Opt. Soc. Am. A 19(12) 2495-2509 (2002)

Background removal in soil analysis using laser- induced breakdown spectroscopy combined with standard addition method

R. X. Yi, L. B. Guo, X. H. Zou, J. M. Li, Z. Q. Hao, X. Y. Yang, X. Y. Li, X. Y. Zeng, and Y. F. Lu
Opt. Express 24(3) 2607-2618 (2016)

Dispersion implementation in optical filter design by the Fourier transform method using correction factors

Stéphane Larouche and Ludvik Martinu
Appl. Opt. 46(30) 7436-7441 (2007)

Multicomponent gas analysis using broadband quantum cascade laser spectroscopy

A. Reyes-Reyes, Z. Hou, E. van Mastrigt, R. C. Horsten, J. C. de Jongste, M. W. Pijnenburg, H. P. Urbach, and N. Bhattacharya
Opt. Express 22(15) 18299-18309 (2014)