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Effects of Humic Substances on the Changes of Dissolved Organic Matter Characteristics by Biodegradation  

Park, Min-Hye (Department of Earth and Environmental Sciences, Sejong University)
Lee, Bo-Mi (Department of Earth and Environmental Sciences, Sejong University)
Lee, Tae-Hwan (Department of Earth and Environmental Sciences, Sejong University)
Hur, Jin (Department of Earth and Environmental Sciences, Sejong University)
Yang, Hee-Jeong (Han-River Environment Research Center)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.3, 2009 , pp. 419-424 More about this Journal
Abstract
Characteristics of humic substances on the changes in dissolved organic matter (DOM) characteristics by biodegradation was investigated using three types of the artificial water samples composed of glucose and Suwannee River fulvic acid (SRFA). Some selected DOM characteristics including the specific UV absorbance (SUVA), the synchronous fluorescence spectra and the molecular weight (MW) were compared for the artificial water samples before and after 28-day microbial incubation. The changes of the DOM characteristics were minimal for SRFA during the incubation whereas they were significant for glucose. SUVA, dissolved organic carbon (DOC)-normalized fluorescence intensity, and MW values of glucose increased, suggesting that such labile organic compounds could be exclusively transformed into more humidified materials by biodegradation. For glucose-SRFA mixture, the selected DOM characteristics were greater than those estimated using the assumption that the individual changes of either glucose or SRFA are conservative for the mixture of the two materials. Our results suggest that the presence of humic substances (HS) may lead to the enhancement of the formation of refractory organic materials during biodegradation of labile compounds. Detailed analyses of size exclusion chromatography (SEC) revealed that the enhancement occurred for the DOM mixture with a MW range between 500 Da to 4000 Da.
Keywords
Biodegradation; Dissolved organic matter; Humic substances; Labile component;
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Times Cited By KSCI : 2  (Citation Analysis)
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