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| - Reduced Pyrene Bioavailability inMicrobially Active Soils
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| - The influence of microbial activity on pyrenebiodegradationand fate was assessed by quantifying the distribution of14C-label and pyrene among soil organic matterfractions(SOM) in soils that contained varied microbialcommunities.A southern, hardwood forest soil was incubated withpyrene in aerated chambers for 9 months. Soil wasincubatedin three sets: soil alone, soil augmented with a pyrene-degrading community, and soil inhibited with sodium azide(NaN3). After 9 months, pyrene mineralization wasobservedonly in the degrader-amended soil set. Most of the pyreneand [14C]pyrene in the NaN3-amended soilset was recoveredby solvent extraction (>75%). The [14C]pyreneextractedfrom the NaN3-amended soil set was mineralized by amicrobialcommunity shown to mineralize pyrene. Extractable pyrenefrom nonamended soil and degrader-amended soil setsdecreased with time due to biodegradation. Extracted labelfrom these soils was not mineralized to the same extentas NaN3-amended soil. Nonextractable label inhumic/fulvic acid and humin fractions was greater in thesesoils than in the NaN3-amended soil set. Pyrenedegradationproducts were detected in biologically active soils byHPLC. Over time, the extractability of pyrene and pyreneproducts in biologically active soils decreased to agreaterextent than NaN3-amended soil.
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