In situ redeposition of trace metals mobilized by CO2-charged brines

Wigley, M. and Kampman, N. and Chapman, H. J. and Dubacq, B. and Bickle, M. J. (2013) In situ redeposition of trace metals mobilized by CO2-charged brines. Geochemistry Geophysics Geosystems, 14 (5). pp. 1321-1332. ISSN 1525-2027 DOI 10.1002/ggge.20104

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Abstract

Mobilization of contaminants by CO2-charged brines is one concern relating to injection of CO2 as part of carbon capture and storage projects. This study monitors the mobility of trace metals in an exhumed CO2-charged aquifer near the town of Green River, Utah (USA), where CO2-charged brines have bleached red sandstones, and concentrated trace metals at the bleaching reaction front. Mass balance calculations on the trace metal enrichments are used to calculate time-integrated fluid fluxes and show that a significant fraction of the metals mobilized by the CO2-rich brines are redeposited locally. A sequential extraction procedure on metal-enriched samples shows that these metals are incorporated into secondary carbonate and oxide phases which have been shown to grow at the CO2-promoted bleaching reaction front. We argue that while CO2-charged brines are capable of mobilizing trace metals, local metal redeposition implies that the potential for contamination of overlying freshwater aquifers is low.

Item Type:	Article
Additional Information:	©2013. American Geophysical Union. All Rights Reserved.
Uncontrolled Keywords:	2013AREP; IA66; Phd
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title:	Geochemistry Geophysics Geosystems
Volume:	14
Page Range:	pp. 1321-1332
Identification Number:	10.1002/ggge.20104
Depositing User:	Sarah Humbert
Date Deposited:	31 Aug 2013 13:39
Last Modified:	11 Jul 2014 11:42
URI:	http://eprints.esc.cam.ac.uk/id/eprint/2863

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