Concentration dependence of the relative error in diffuse reflectance infrared spectrometry

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Abstract

A mathematical model between the relative error in the Kubelka-Munk (K-M) function and the sample concentration has been determined if the K-M function is linear with the sample concentration, c≤ w/w%. The theoretical model has been investigated by measuring 3-5 parallels at different sample concentrations and calculating the RSD for the selected absorption bands. Quartz (dave = 1.3 μm) and calcite (dave = 3.3 μm) as analytes and KBr (dave = 9.9 μm) as embedding material were used. The result of the model and the experiments were in a good agreement. It has been shown that the RSD for absorption bands with small sensitivity can increase up to ±20-60%. The precision of the quantitative analysis in diffuse reflectance infrared Fourier transform spectrometry (DRIFTS) can be improved by applying more sensitive absorption bands and parallel measurements at one standard concentration.

Original languageEnglish
Pages (from-to)2197-2202
Number of pages6
JournalSpectrochimica Acta Part A: Molecular Spectroscopy
Volume50
Issue number13
DOIs
Publication statusPublished - Nov 1994

ASJC Scopus subject areas

  • Engineering(all)

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