Fluorescence quenching of synthetic organic compounds by humic materials
Article Abstract:
University of Idaho researchers studying the limitations of fluorescence quenching - a technique for ascertaining equilibrium constants between synthetic organic fluorophores and water soluble humic substances - were able to demonstrate that the humic acids do not exhibit single-exponential decay, as postulated by the Stern-Volmer theory. They advised caution when using fluorescence quenching as an analytical technique. Experimental procedures and results are described in detail.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1992
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Quantitative approach to humic acid associations
Article Abstract:
Polarization studies were conducted on aqueous solutions of humic acid. 2,5-diphenyloxazole was used as a fluorescence probe. A quantitative association index was developed for nonreactive interactions between humic acid and the fluorescence probe. Results indicated the presence of an intermolecular component in the association of humic acid with nonpolar organic compounds, leading to pseudomicellar behavior dependent on the polydispersity of the humic acid solution.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Kinetic aspects of cation-enhanced aggregation in aqueous humic acids
Article Abstract:
Humic acid reactions to cations have been found to be transitory with humic acids and cations forming hydrophobic pseudomicelles that later disintegrate as metal ions gradually migrate to locations that allow them to form stable inner-sphere complexes. Magnesium salt addition to humic acid produced the hydrophobic pseudomicelles that later desintegrated in a self-reversing reaction where metal ion migration.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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