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Fluorescence spectroscopic studies of natural organic matter fractions

by J Chen, E J LeBoeuf, S Dai, B Gu
Chemosphere ()
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Abstract

Because of the well-known molecular complexity and heterogeneity of natural organic matter (NOM), an aquatic\nbulk NOM was fractionated into well-defined polyphenolic-rich and carbohydrate-rich subfractions. These fractions\nwere systematically characterized by fluorescence emission, three dimensional excitation-emission matrices, and synchronous-\nscan excitation spectroscopy in comparison with those of the reference International Humic Substances\nSociety soil humic acid and Suwannee River fulvic acid. Results indicate that fluorescence spectroscopy can be useful to\nqualitatively differentiate not only NOM compounds from varying origins but also NOM subcomponents with varying\ncompositions and functional properties. The polyphenolic-rich NOM-PP fraction exhibited a much more intense fluorescence\nand a red shift of peak position in comparison with the carbohydrate-rich NOM-CH fraction. Results also\nindicate that synchronous excitation spectra were able to provide improved peak resolution and structural signatures\nsuch as peak positioning, shift, and intensity among various NOM components as compared with those of the emission\nand excitation spectra. In particular, the synchronous spectral peak intensity and its red shift in the region of about\n450�480 nm may be used to indicate the presence or absence of high molecular weigh

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