The linearity of plots of the Kubelka-Munk function against concentration is investigated for weak and strong absorption bands in the spectrum of a typical organic analyte, caffeine. The linear region is extended when measurements are made with an off-axis optical geometry, in comparison
to an in-line configuration. For the latter configuration, the linearity is improved when crossed polarizers are placed before and after the sample.
Department of Chemistry, University of California, Riverside, California 92521-0403
Publication date: February 1, 1988
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