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Role of loosely bound humic substances and humin in the bioavailability of phenanthrene aged in soil

Cited 63 time in Web of Science Cited 68 time in Scopus
Authors
Nam, Kyoungphile; Kim, Jaeyoung
Issue Date
2002-08
Publisher
Elsevier
Citation
Environmental Pollution 118, 427-433
Keywords
AgingBioavailabilityFulvic acidHumic acidHuminPhenanthrene
Abstract
A study was conducted to determine a possible role of loosely bound humic substances (i.e., humic and fulvic acids) in bioavailability of aged phenanthrene with time. In this study, long-term residence of phenanthrene in soil is defined as aging or sequestration, and the effect was determined by the declined bioavailability to bacteria of the polycyclic aromatic hydrocarbon with increased residence time. After 1, 7, and 100 days of aging of phenanthrene in Lima loam, about 90-93% of initial phenanthrene was recovered from the humin-mineral fraction of Lima loam whereas less than 12% was found in humic and fulvic acids of the same soil. Mineralization rates of phenanthrene aged in the humin-mineral fraction significantly decreased with time by the test bacterium P5-2. In terms of extents of mineralization, the difference with time was not appreciable, but still significant at P<0.05. Additional decreases in the rates and extents of mineralization were observed with the whole soil (i.e. Lima loam) to which phenanthrene had been aged. Data suggest that major sequestration sites for phenanthrene may reside in the humin-mineral fraction, and probably humic and fulvic acids may act as a physico-chemical barrier to bacterial degradation so that the compound's bioavailability may be limited.
ISSN
0269-7491
Language
English
URI
http://hdl.handle.net/10371/8729
DOI
https://doi.org/10.1016/S0269-7491(01)00296-2
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Civil & Environmental Engineering (건설환경공학부)Journal Papers (저널논문_건설환경공학부)
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