Document Detail


Cerro Negro bitumen degradation by a consortium of marine benthic microorganisms.
MedLine Citation:
PMID:  11352029     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Cerro Negro bitumen, separated from an Orimulsion sample, was incubated for up to 120 days with sediments collected at a petroleum-impacted site in Tampa Bay, Florida. Biodegradation conditions were optimized by increasing bitumen surface area, continuous agitation on a shaker apparatus, use of a complete growth medium, and maintenance at 37 degrees C. Aerobic degradation conditions were promoted by maintaining sediment contact with the laboratory atmosphere. Bitumen recovered in solvent extracts when compared to autoclaved controls decreased by up to 40% during the first 56 days. There was no detectable change after this. Molasses addition and use of a culture enriched from the sediments did not change the extent or rate of decrease in bitumen recovery. Chemical fractionation of bitumen control and degraded bitumen showed that aromatic and aliphatic fractions were depleted by approximately equals 50%. Accumulation of polars was observed; however, the apparent increase was relatively small when compared to the mass loss of the other fractions. Selected biomarker ratios were not affected by incubation indicating their utility for fingerprinting the source bitumen in environmental samples. PAH distribution in the aromatic fraction favored the higher alkyl-homologues with the relative degree of alkylation increasing as the mass of bitumen recovered decreased with degradation. The study showed that up to 40% of the bitumen was bioaccessible and that bioremediation may be a treatment option for sediments contaminated with bitumen by an Orimulsion spill.
Authors:
T L Potter; B Duval
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  35     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-05-15     Completed Date:  2001-06-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  76-83     Citation Subset:  IM    
Affiliation:
USDA-ARS, Southeast Watershed Research Laboratory, Tifton, Georgia 31793, USA. tpotter@tifton.cpes.peachnet.edu
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MeSH Terms
Descriptor/Qualifier:
Aerobiosis
Emulsions
Environmental Pollutants / metabolism
Gas Chromatography-Mass Spectrometry
Geologic Sediments / microbiology*
Hydrocarbons / chemistry,  metabolism*
Surface-Active Agents
Water
Chemical
Reg. No./Substance:
0/Emulsions; 0/Environmental Pollutants; 0/Hydrocarbons; 0/Surface-Active Agents; 7732-18-5/Water; 8052-42-4/asphalt

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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