Experimental Assessment of CO2-Mineral-Toxic Ion Interactions in a Simplified Freshwater Aquifer: Implications for CO2 Leakage from Deep Geological Storage

Détails

ID Serval
serval:BIB_74E9DEEF5A18
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Experimental Assessment of CO2-Mineral-Toxic Ion Interactions in a Simplified Freshwater Aquifer: Implications for CO2 Leakage from Deep Geological Storage
Périodique
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Auteur⸱e⸱s
Montes-Hernandez German, Renard Francois, Lafay Romain
ISSN-L
0013-936X
Statut éditorial
Publié
Date de publication
18/06/2013
Volume
47
Numéro
12
Pages
6247-6253
Notes
ISI:000320749000023
Résumé
The possible intrusion of CO2 into a given freshwater aquifer due to
leakage from deep geological storage involves a decrease in pH, which
has been directly associated with the remobilization of hazardous trace
elements via mineral dissolution and/or via desorption processes. In an
effort to evaluate the potential risks to potable water quality, the
present study is devoted to experimental investigation of the effects of
CO2 intrusion on the mobility of toxic ions in simplified equilibrated
aquifers. We demonstrate that remobilization of trace elements by CO2
intrusion is not a universal physicochemical effect. In fact goethite
and calcite, two minerals frequently found in aquifers, could
successfully prevent the remobilization of adsorbed Cu(II), Cd(II),
Se(IV), and As(V) if CO2 is intruded into a drinking water aquifer.
Furthermore, a decrease in pH resulting from CO2 intrusion could
reactivate the adsorption of Se(IV) and As(V) if goethite and calcite
are sufficiently available in underground layers. Our results also
suggest that adsorption of cadmium and copper could be promoted by
calcite dissolution. These adsorbed ions on calcite are not remobilized
when CO2 is intruded into the system, but it intensifies calcite
dissolution. On the other hand, arsenite As(III) is significantly
adsorbed on goethite, but is partially remobilized by CO2 intrusion.
Création de la notice
08/09/2014 11:50
Dernière modification de la notice
20/08/2019 14:32
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