PAPER ACIDITY ESTIMATION - APPLICATION OF PH-DEPENDENT FLUORESCENCE PROBES

Citation
Jn. Moorthy et al., PAPER ACIDITY ESTIMATION - APPLICATION OF PH-DEPENDENT FLUORESCENCE PROBES, Journal of photochemistry and photobiology. A, Chemistry, 113(2), 1998, pp. 189-195
Citations number
20
Categorie Soggetti
Chemistry Physical
ISSN journal
10106030
Volume
113
Issue
2
Year of publication
1998
Pages
189 - 195
Database
ISI
SICI code
1010-6030(1998)113:2<189:PAE-AO>2.0.ZU;2-#
Abstract
The use of pH-dependent fluorescence probes for paper acidity estimati on has been explored. The changes in emission properties of the four p robes (quinine bisulphate, fluorescein, pyranine and SNAFL-1, a semina phthofluorescein dye) in buffer solutions of varying pHs are found to correlate with the respective changes observed for the probes applied on paper samples of varying acidity. The remarkable correlations sugge st that the paper acidity ('pH(app)') can be inferred by extrapolating the probe behavior on paper samples to that in aqueous solutions of v arying pHs. Thus, with a judicious choice of pH-dependent fluorescence probes, a wider range of pH indicators of paper acidity are possible to be developed. This methodology promises a non-destructive alternati ve to measure acidity of paper. (C) 1998 Elsevier Science S.A.