Computer Science
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71..271k&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 71, Issue 2, p. 271-283.
Computer Science
14
Scientific paper
Carbon isotope fractionation factors associated with the aerobic consumption of methane (C1), ethane (C2), propane (C3), and n-butane (C4) were determined from incubations of marine sediment collected from the Coal Oil Point hydrocarbon seep field, located offshore Santa Barbara, CA. Hydrogen isotope fractionation factors for C1, C2 and C3 were determined concurrently. Fresh sediment samples from two seep areas were each slurried with sea water and treated with C1, C2, C3 or C4, or with mixtures of all four gases. Triplicate samples were incubated aerobically at 15 °C, and the stable isotope composition and headspace levels of C1 C4 were monitored over the course of the experiment. Oxidation was observed for all C1 C4 gases, with an apparent preference for C3 and C4 over C1 and C2 in the mixed-gas treatments. Fractionation factors were calculated using a Rayleigh model by comparing the δ13C and δD of the residual C1 C4 gases to their headspace levels. Carbon isotope fractionation factors (reported in ɛ or (α-1) × 1000 notation) were consistent between seep areas and were -26.5‰ ± 3.9 for C1, -8.0‰ ± 1.7 for C2, -4.8‰ ± 0.9 for C3 and -2.9‰ ± 0.9 for C4. Fractionation factors determined from mixed gas incubations were similar to those determined from individual gas incubations, though greater variability was observed during C1 consumption. In the case of C1 and C3 consumption, carbon isotope fractionation appears to decrease as substrate becomes limiting. Hydrogen isotope fractionation factors determined from the two seep areas differed for C1 oxidation but were similar for C2 and C3. Hydrogen isotope fractionation factors ranged from -319.9‰ to -156.4‰ for C1 incubations, and averaged -61.9‰ ± 8.3 for C2 incubations and -15.1‰ ± 1.9 for C3 incubations. The fractionation factors presented here may be applied to estimate the extent of C1 C4 oxidation in natural gas samples, and should prove useful in further studying the microbial oxidation of these compounds in the natural environment.
Kinnaman Franklin S.
Tyler Stanley C.
Valentine David L.
No associations
LandOfFree
Carbon and hydrogen isotope fractionation associated with the aerobic microbial oxidation of methane, ethane, propane and butane does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Carbon and hydrogen isotope fractionation associated with the aerobic microbial oxidation of methane, ethane, propane and butane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carbon and hydrogen isotope fractionation associated with the aerobic microbial oxidation of methane, ethane, propane and butane will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1254536