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Changes in 14C Activity Over Time During Vacuum Distillation of Carbon from Rock Pore Water

Published online by Cambridge University Press:  18 July 2016

G R Davidson  and
I C Yang
G R Davidson
Affiliation:
Department of Geology and Geological Engineering, Carrier Hall, The University of Mississippi University MS 38677 USA
I C Yang
Affiliation:
US Geological Survey, MS-421, Lakewood, CO 80225 USA
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Abstract

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The radiocarbon activity of carbon collected by vacuum distillation from a single partially saturated tuff began to decline after approximately 60% of the water and carbon had been extracted. Disproportionate changes in 14C activity and δ13C during distillation rule out simple isotopic fractionation as a causative explanation. Additional phenomena such as matrix diffusion and ion exclusion in micropores may play a role in altering the isotopic value of extracted carbon, but neither can fully account for the observed changes. The most plausible explanation is that distillation recovers carbon from an adsorbed phase that is depleted in 14C relative to DIC in the bulk pore water.

Type
Articles
Information
Radiocarbon , Volume 41 , Issue 2 , 1999 , pp. 141 - 148
Copyright
Copyright © The American Journal of Science 

References

Bird, RB, Stewart, WE, Lightfoot, EN. 1960. Transport phenomena. New York, John Wiley & Sons. 780 p.Google Scholar
Davidson, GR. 1995. Geochemical and isotopic investigation of the rate and pathway of fluid flow in partially-welded fractured unsaturated tuff [dissertation]. Tucson: University of Arizona. 208 p.Google Scholar
Davidson, GR, Bassett, RL, Hardin, EL, Thompson, DL. 1998. Geochemical evidence of preferential flow of water through fractures in unsaturated tuff, Apache Leap, Arizona. Applied Geochemistry 13:185–95.Google Scholar
Davidson, GR, Hardin, EL, Bassett, RL. 1995. Extraction of 14C from pore water in unsaturated rock using vacuum distillation. Radiocarbon 37(3):861–74.Google Scholar
Deines, WG, Langmuir, D, Harmon, RS. 1974. Stable carbon isotope ratios and the existence of a gas phase in the evolution of carbonate groundwaters. Geochimica et Cosmochimica Acta 38:1147–64.Google Scholar
Fritz, S, Hinz, DW, Grossman, EL. 1987. Hyperfiltration induced fractionation of carbon isotopes. Geochimica et Cosmochimica Acta 51:1121–34.Google Scholar
Lide, DR, editor. 1997. CRC Handbook of Chemistry and Physics. 77th ed. Boca Raton (FL), CRC Press.Google Scholar
Mook, WG, Bommerson, JC, Staverman, WH. 1974. Carbon isotope fractionation between dissolved bicarbonate and gaseous carbon dioxide. Earth and Planetary Science Letters 22:169–76.Google Scholar
Neretnieks, I. 1981. Age dating of groundwater in fissured rock: influence of water volume in micropores. Water Resources Research 17:421–2.Google Scholar
Peters, CA, Yang, IC, Higgins, JD, Burger, PA. 1992. A preliminary study of the chemistry of pore water extracted from tuff by one-dimensional compression. In: Kharaka, YK, Maest, AS, editors. Water-rock interaction: proceedings of the 7th International Symposium on Water-Rock Interaction; Park City, Utah, 13–18 July 1992. Rotterdam: A. A. Balkema. p. 741–5.Google Scholar
Rautman, CA, Engstrom, DA. 1996. Geology of the USW SD-12 drill hole, Yucca Mountain, Nevada. Sandia Report SAND96-1368, Sandia National Laboratories, Albuquerque, New Mexico. 132 p.Google Scholar
Striegl, RG. 1988. Exchange and transport of 14-carbon dioxide in the unsaturated zone [dissertation]. Madison: University of Wisconsin. 149 p.Google Scholar
Striegl, RG, Armstrong, DE. 1990. Carbon dioxide retention and carbon exchange on unsaturated Quaternary sediments. Geochimica et Cosmochimica Acta 54: 2277–83.Google Scholar
Yang, IC, Yu, P, Rattray, GW, Ferarese, JS, Ryan, JN. 1998. Hydrochemical investigations in characterizing the unsaturated-zone at Yucca Mountain, Nevada. US Geological Survey Water-Resources Investigation Report 98-4132. 57 p.Google Scholar
Yang, IC, Herbert, HH, Weeks, EP, Thorstenson, DC. 1985. Analysis of gaseous-phase stable and radioactive isotopes in the unsaturated zone, Yucca Mountain, Nevada. In: Proceedings of the National Water Well Association conference on Characterization and Monitoring of the Vadose (Unsaturated) Zone, 19–21 November 1985, Denver. Denver: National Water Well Association. p. 488–506.Google Scholar