COMPOUND-SPECIFIC D/H RATIOS OF LIPID BIOMARKERS FROM SEDIMENTS AS A PROXY FOR ENVIRONMENTAL AND CLIMATIC CONDITIONS
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dc.contributor.author | Sauer P.E. | |
dc.contributor.author | Eglinton T.I. | |
dc.contributor.author | Hayes J.M. | |
dc.contributor.author | Schimmelmann A. | |
dc.contributor.author | Sessions A.L. | |
dc.date.accessioned | 2021-02-10T01:45:02Z | |
dc.date.available | 2021-02-10T01:45:02Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=548200 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2001, 65, 2, 213-222 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24600 | |
dc.description.abstract | Hydrogen isotope ratios (D/H) of lipid biomarkers extracted from aquatic sediments were measured to determine whether they can be used as a proxy for D/H of environmental water. Values of δD were determined by using a recently developed isotope-ratio-monitoring gas chromatograph-mass spectrometer system (irmgcms) and were confirmed by conventional hydrogen isotopic measurements (i.e., combustion followed by reduction) on individual compounds isolated by preparative capillary gas chromatography. Diverse lipids (alkanes, n-alkanols, sterols, and pentacyclic triterpenols) were analyzed to examine hydrogen-isotopic controls on lipids of varying origin and biosynthetic pathway. For algal sterols (24-methylcholest-3β-ol, 24-ethylcholest-5,22-dien-3β-ol, and 4,23,24-trimethylcholesterol, or dinosterol), the fractionation between sedimentary lipids and environmental water was -201 +/- 10%% and was similar in both marine and freshwater sites. In a sediment from a small lake in a forested catchment, triterpenols from terrestrial sources were enriched in D by 30%% relative to algal sterols. Apparent fractionation factors for n-alkyl lipids were smaller than those of triterpenols and were more variable, probably reflecting multiple sources for these compounds. We conclude that hydrogen-isotopic analyses of algal sterols provide a viable means of reconstructing D/H of environmental waters. Results are less ambiguous than reconstructions based on analyses of kerogen or other operationally defined organic matter fractions. | |
dc.title | COMPOUND-SPECIFIC D/H RATIOS OF LIPID BIOMARKERS FROM SEDIMENTS AS A PROXY FOR ENVIRONMENTAL AND CLIMATIC CONDITIONS | |
dc.type | Статья |
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