Laboratory methods for evaluating migrated high molecular weight hydrocarbons in marine sediments at naturally occurring oil seeps

Autor:	Nicola F. Dahdah, Michael A. Abrams, Graham A. Logan, Emmanuelle Grosjean
Rok vydání:	2009
Předmět:	Chromatography Stable isotope ratio chemistry.chemical_element Mass spectrometry Hexane chemistry.chemical_compound Unresolved complex mixture chemistry Geochemistry and Petrology Environmental chemistry Petroleum Gas chromatography Water pollution Carbon
Zdroj:	Organic Geochemistry. 40:365-375
ISSN:	0146-6380
DOI:	10.1016/j.orggeochem.2008.11.009
Popis:	A laboratory study has been conducted to determine the best methods for the detection of C 10 –C 40 hydrocarbons at naturally occurring oil seeps in marine sediments. The results indicate that a commercially available method using n -C 6 to extract sediments and gas chromatography–flame ionization detection (GC–FID) to screen the resulting extract is effective at recognizing the presence of migrated hydrocarbons at concentrations from 50 to 5000 ppm. When non-biodegraded, the amount of oil charge is effectively tracked by the sum of n -alkanes in the gas chromatogram. However, once the charge oil becomes biodegraded, with the loss of n -alkanes and isoprenoids, the amount of oil is tracked by the quantification of the unresolved complex mixture (UCM). Gas chromatography–mass spectrometry (GC–MS) was also found to be very effective for the recognition of petroleum related hydrocarbons and results indicate that GC–MS would be a very effective tool for screening samples at concentrations below 50 ppm oil charge.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dc9ef12598e5cefa10dbbe88a8afc9c9 https://doi.org/10.1016/j.orggeochem.2008.11.009 Zobrazit plný text záznamu Full Text from ScienceDirect