title: Simulation of the potential effects of CO2 leakage from carbon capture and storage activities on the mobilization and speciation of metals.
abstract: One of the main risks associated with carbon capture and storage (CCS) activities is the leakage of the stored CO2, which can result in several effects on the ecosystem. Laboratory-scale experiments were performed to provide data on the possible effects of CO2 leakage from CCS on the mobility of metals previously trapped in sediments. Metal-contaminated sediments were collected and submitted to acidification by means of CO2 injection using different pH treatments. The test lasted 10 days, and samples were collected at the beginning and at the end of the experiment for metal analysis. The results revealed increases in the mobility of metals such as Co, Cu, Fe, Pb and Zn due to pH decreases. Geochemical modeling demonstrated that acidification influenced the speciation of the metals, increasing the concentrations of their free forms. These data suggest the possible sediment contamination consequences of accidental CO2 leakage during CCS activities.
authors.affiliation: Cátedra UNESCO/UNITWIN/WiCop, Departamento de Química Física, Universidad de Cádiz, CP 11510 Puerto Real, Cádiz, Spain. Electronic address: manoela.romano@uca.es.
authors.forename: Manoela Romanó
authors.initials: MR
authors.lastname: de Orte
authors.affiliation: Departamento de Geodinámica y Paleontología, Universidad de Huelva, Campus 'El Carmen', CP 21071 Huelva, Spain.
authors.forename: Aguasanta M
authors.initials: AM
authors.lastname: Sarmiento
authors.affiliation: Cátedra UNESCO/UNITWIN/WiCop, Departamento de Química Física, Universidad de Cádiz, CP 11510 Puerto Real, Cádiz, Spain.
authors.forename: T Ángel
authors.initials: TÁ
authors.lastname: DelValls
authors.affiliation: Cátedra UNESCO/UNITWIN/WiCop, Departamento de Química Física, Universidad de Cádiz, CP 11510 Puerto Real, Cádiz, Spain.
authors.forename: Inmaculada
authors.initials: I
authors.lastname: Riba
mesh_terms: D002245:Carbon Dioxide / Q000009:adverse effects / Q000737:chemistry*; D003198:Computer Simulation; D004787:Environmental Pollution / Q000517:prevention & control*; D019015:Geologic Sediments / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000737:chemistry*; D008956:Models, Chemical
chemical_list: D019216:Metals, Heavy; D002245:Carbon Dioxide
keywords: Acidification; Carbon capture and storage (CCS); Contamination; Metal mobility; Risk; Speciation