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Article Dans Une Revue Geochemistry, Geophysics, Geosystems Année : 2013

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

Résumé

Mobilization of contaminants by CO2-charged brinesis one concern relating to injection of CO2 aspart 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.
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Dates et versions

hal-00927648 , version 1 (13-01-2014)

Identifiants

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M. Wigley, N. Kampman, H.J. Chapman, Benoît Dubacq, M.J. Bickle. In situ redeposition of trace metals mobilized by CO2-charged brines. Geochemistry, Geophysics, Geosystems, 2013, 14 (5), pp.1321-1332. ⟨10.1002/ggge.20104⟩. ⟨hal-00927648⟩
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