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Relationship of Soil Organic Matter Characteristics to Organic Contaminant Sequestration and Bioavailability
Author(s) -
Lueking Angela D.,
Huang Weilin,
SoderstromSchwarz Sara,
Kim Minsun,
Weber Walter J.
Publication year - 2000
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2000.00472425002900010040x
Subject(s) - organic matter , environmental chemistry , sorption , desorption , chemistry , phenanthrene , bioavailability , mineralization (soil science) , soil organic matter , soil water , adsorption , soil science , environmental science , organic chemistry , bioinformatics , nitrogen , biology
Sorption and desorption equilibria of phenanthrene with respect to three different types of geosorbents were measured, as were the rates of desorption and biological mineralization of this representative hydrophobic organic contaminant. The chemical nature of the organic matter associated with each geosorbent was characterized using solid state 13 C‐NMR spectrometry. The results of these studies reveal that both the desorption behavior and the microbial bioavailability of the sorbed contaminant are influenced by the physicochemical character of the organic matter. The more reduced and condensed the organic matter, the greater the extent of sorption‐desorption hysteresis, the slower the desorption rate, and the less readily bioavailable the sorbed contaminant. These observations are consistent with projections predicated on a dual reactive domain model introduced earlier to describe the sorptive reactivities of different types of soil/sediment organic matter with hydrophobic organic contaminants.