Pogge von Strandmann, Philip A.E. and Burton, K. and Snaebjornsdottir, S. and Sigfusson, B. and Aradottir, E. and Gunnarsson, I. and Alfredsson, H. and Mesfin, K. and Oelkers, E. and Gislason, S. (2019) Rapid CO2 mineralisation into calcite at the CarbFix storage site quantified using calcium isotopes. Nature Communications , ISSN 2041-1723.
|
Text
Pogge von Strandmann 2019 CarbFix Ca isotopes.pdf - Published Version of Record Available under License Creative Commons Attribution. Download (732kB) | Preview |
Abstract
The engineered removal of atmospheric CO2 is now considered a key component of mitigating climate warming below 1.5 °C. Mineral carbonation is a potential negative emissions technique that, in the case of Iceland’s CarbFix experiment, precipitates dissolved CO2 as carbonate minerals in basaltic groundwater settings. Here we use calcium (Ca) isotopes in both pre- and post-CO2 injection waters to quantify the amount of carbonate precipitated, and hence CO2 stored. Ca isotope ratios rapidly increase with the pH and calcite saturation state, indicating calcite precipitation. Calculations suggest that up to 93% of dissolved Ca is removed into calcite during certain phases of injection. In total, our results suggest that 165 ± 8.3 t CO2 were precipitated into calcite, an overall carbon storage efficiency of 72 ± 5%. The success of this approach opens the potential for quantification of similar mineral carbonation efforts where drawdown rates cannot be estimated by other means.
Metadata
| Item Type: | Article |
|---|---|
| School: | Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences |
| Depositing User: | Philip Pogge Von Strandmann |
| Date Deposited: | 02 May 2019 09:46 |
| Last Modified: | 02 Aug 2023 17:51 |
| URI: | https://eprints.bbk.ac.uk/id/eprint/27381 |
Statistics
Additional statistics are available via IRStats2.
Archive Staff Only (login required)
