Document Detail

In situ lubricant degradation in Antarctic marine sediments. 1. Short-term changes.
MedLine Citation:
PMID:  16519295     Owner:  NLM     Status:  MEDLINE    
A large-scale, in situ experiment was set up near the Bailey Peninsula area (Casey Station, East Antarctica) to monitor the natural attenuation of synthetic lubricants in marine sediments over five years. Here, we report the short-term changes after 5 and 56 weeks. The lubricants tested were an unused and used Mobil lubricant (0W/40; Exxon Mobil, Irving, TX, USA) and a biodegradable alternative (0W/20; Fuchs Lubricants, Harvey, IL, USA). Clean sediment was collected, contaminated with the lubricants, and deployed by divers onto the seabed in a randomized block design. The sampled sediments were analyzed by gas chromatography-flame-ionization detector and gas chromatography-mass spectrometry with selective ion monitoring. The base fluid of all lubricant treatments did not decrease significantly after 56 weeks in situ. Alkanoate esters of 1,1,1-tris(hydroxymethyl)propane in the biodegradable and unused lubricants were degraded extensively in situ; however, these esters constituted only a minor proportion of the lubricant volume. The additives, alkylated naphthalenes and substituted diphenylamines, were fairly resistant to degradation, which is of environmental concern because of their toxicity. The biodegradable lubricant did not break down to recognized biodegradable thresholds and, as such, should not be classified as biodegradable under Antarctic marine conditions. A separate experiment was conducted to determine the influence of sediment preparation and deployment on compound ratios within the lubricants, and we found that preparation and deployment of the contaminated sediments had only a minor effect on compound recovery. Further monitoring of this in situ experiment will provide much needed information about the long-term natural attenuation of lubricants.
Belinda A W Thompson; Noel W Davies; Paul M Goldsworthy; Martin J Riddle; Ian Snape; Jonathan S Stark
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  25     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-03-07     Completed Date:  2006-06-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  356-66     Citation Subset:  IM    
Human Impacts Research Program, Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia.
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MeSH Terms
Antarctic Regions
Biodegradation, Environmental
Environmental Monitoring
Environmental Pollutants / metabolism*
Geologic Sediments / chemistry*
Hydrocarbons / metabolism*
Reg. No./Substance:
0/Environmental Pollutants; 0/Hydrocarbons

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

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