Compound-specific radiocarbon analyses of phospholipid fatty acids and 
n-alkanes in ocean sediments

Druffel, E. R. M.; Zhang, D. C.; Xu, X. M.; Ziolkowski, L. A.; Southon, J. R.; dos Santos, G. M.; Trumbore, Susan E.

doi:10.1017/S0033822200046294

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Compound-specific radiocarbon analyses of phospholipid fatty acids and n-alkanes in ocean sediments

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https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3619
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Citation

Druffel, E. R. M., Zhang, D. C., Xu, X. M., Ziolkowski, L. A., Southon, J. R., dos Santos, G. M., et al. (2010). Compound-specific radiocarbon analyses of phospholipid fatty acids and n-alkanes in ocean sediments. Radiocarbon, 52(3), 1215-1223. doi:10.1017/S0033822200046294.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-F729-F

Abstract

We report compound-specific radiocarbon analyses of organic matter in ocean sediments from the northeast Pacific Ocean. Chemical extractions and a preparative capillary gas chromatograph (PCGC) were used to isolate phospholipid fatty acids (PLFA) and n-alkanes from 3 cores collected off the coast of California, USA. Mass of samples for accelerator mass spectrometry (AMS) C-14 analysis ranged from 13-100 mu g C. PLFA extracted from anaerobic sediments in the Santa Barbara Basin (595 m depth) had modem Delta C-14 values (-20 to +54 parts per thousand), indicating bacterial utilization of surface-produced, post-bomb organic matter. Lower Delta C-14 values were obtained for n-alkanes and PLFA from coast (92 m depth) and continental slope (1866 m) sediments, which reflect sources of old organic matter and bioturbation. We present a brief analysis of the blank carbon introduced to samples during chemical processing and PCGC isolation.