NDLI: An “On-Line” Method for Oxygen Isotope Exchange Between Gas-Phase CO2 and Water

Content Provider	Springer Nature Link
Author	Levitt, Nicholas Paul Romanek, Christopher S.
Copyright Year	2016
Abstract	An “on-line” mixing system has been developed and evaluated for continuous oxygen isotope exchange between gas-phase CO2 and liquid water. The system is composed of three basic parts: equipment and materials used to introduce water and gas into a mixing reservoir, the mixing and exchange reservoir, and a vessel used to separate gas and water phases exiting the system. A series of experiments were performed to monitor the isotope exchange process over a range of temperatures (5–40 °C) and CO2 partial pressures (202–15,200 Pa). Isotopic exchange was evaluated using CO2 having δ18O values of 30.4 and 37.8 ‰ and waters of two distinct oxygen isotope compositions (−6.5 to −5 and 6 to 7.5 ‰). Isotope ratios were determined by isotope ratio mass spectrometry and cavity ring-down spectroscopy. CO2 did not reach oxygen isotope equilibrium under the conditions described here. However, oxygen isotope exchange rate constants were determined at different temperatures and regressed to yield the expression k (h−1) = 0.020 × T (°C) + 0.28. Using this expression, the residence time required to reach oxygen isotope equilibrium may be estimated for a given set of environmental conditions (e.g., δ18O value of water, temperature). System parameters can be modified to achieve a specific δ18O value for CO2. Consequently, the exchange system described here has the ability to deliver a constant flow of CO2 at a desired oxygen isotope composition. This ability is attractive for a variety of applications such as experiments that utilize flow-through reactors and environmental chambers or require static chemical conditions.
Starting Page	253
Ending Page	269
Page Count	17
File Format	PDF
ISSN	13806165
Journal	Aquatic Geochemistry
Volume Number	22
Issue Number	3
e-ISSN	15731421
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-04-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon dioxide Oxygen isotopes Isotope equilibrium Isotope kinetics Dissolved inorganic carbon Geochemistry Hydrology/Water Resources Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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