Mcintyre, C. P. , McNichol, A. P., Roberts, M. L., Seewald, J. S., von Reden, K. F. and Jenkins, W. J. (2013) Improved precision of radiocarbon measurements for Ch4 and Co2 using GC and continuous-flow AMS achieved by summation of repeated injections. Radiocarbon, 55(2-3), 677- 685.
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Abstract
Compound specific radiocarbon measurements can be made instantaneously using a gas chromatograph (GC) combustion system coupled to a 14C AMS system fitted with a gas ion source. Samples below 10 µg C can be analyzed but the precision is reduced to 5–10% because of lower source efficiency. We modified our GC for CH4 and CO2 analysis and injected samples multiple times to sum data and increase precision. We attained a maximum precision of 0.6% for modern CO2 from 25 injections of 27 µg C and a background of ~0.5% (40 kyr) for ancient methane. The 14C content of dissolved CO2 and CH4 in water samples collected at a deep-sea hydrothermal vent and a serpentine mud volcano was measured and the results for the vent sample are consistent with previously published data. Further experiments are required to determine a calibration and correction procedure to maximize accuracy.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Mcintyre, Dr Cameron |
Authors: | Mcintyre, C. P., McNichol, A. P., Roberts, M. L., Seewald, J. S., von Reden, K. F., and Jenkins, W. J. |
College/School: | College of Science and Engineering > Scottish Universities Environmental Research Centre |
Journal Name: | Radiocarbon |
Publisher: | University of Arizona |
ISSN: | 0033-8222 |
ISSN (Online): | 1945-5755 |
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