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Depth Profiling of a Photochemically Yellowed Paper. Part I: UV-Visible Reflectance and Fluorescence Spectroscopy

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A strongly photochemically yellowed paper having a reflectance at 457 nm of 53% (initial reflectance 73%) containing high-yield pulp from softwood was ground off to varying depths. The resulting papers were studied with the use of UV-visible diffuse reflectance and fluorescence spectroscopy. Yellowing penetration depth was determined and the chromophore distribution in the z direction was characterized with the aid of difference spectra. Expressed as the amount of chromophores based on the specific adsorption coefficient, 25% of the yellowing had occurred at a depth of 10-12 μm, 50% at 15-20 μm, and 75% at 25-30 μm. The fluorescence spectroscopy results showed that 50% of the changes induced by light had occurred at a depth of about 20 μm.

Keywords: Chromophore; Diffuse reflectance; Fluorescence; Light induced; Mechanical pulp; Paper; Spectroscopy; Surface analysis; Ultraviolet; Yellowing

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702953963283

Affiliations: 1: The Finnish Pulp and Paper Research Institute (KCL), Paper Science Centre, P.O. Box 70, FIN-02151, Espoo, Finland 2: Department of Chemistry, University of Helsinki, P.O. Box 19, FIN-00014, Helsinki, Finland

Publication date: January 1, 1995

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