title: Evaluation through column leaching tests of metal release from contaminated estuarine sediment subject to CO₂ leakages from Carbon Capture and Storage sites.
abstract: The pH change and the release of organic matter and metals from sediment, due to the potential CO(2) acidified seawater leakages from a CCS (Carbon Capture and Storage) site are presented. Column leaching test is used to simulate a scenario where a flow of acidified seawater is in contact with recent contaminated sediment. The behavior of pH, dissolved organic carbon (DOC) and metals As, Cd, Cr, Cu, Ni, Pb, Zn, with liquid to solid (L/S) ratio and pH is analyzed. A stepwise strategy using empirical expressions and a geochemical model was conducted to fit experimental release concentrations. Despite the neutralization capacity of the seawater-carbonate rich sediment system, important acidification and releases are expected at local scale at lower pH. The obtained results would be relevant as a line of evidence input of CCS risk assessment, in an International context where strategies to mitigate the climate change would be applied.
authors.affiliation: Department of Chemical Engineering and Inorganic Chemistry, ETSIIT, University of Cantabria, Avda. de los Castros s/n, 39005 Santander, Spain.
authors.forename: M Cruz
authors.initials: MC
authors.lastname: Payán
authors.forename: Berta
authors.initials: B
authors.lastname: Galan
authors.forename: Alberto
authors.initials: A
authors.lastname: Coz
authors.forename: Carlo
authors.initials: C
authors.lastname: Vandecasteele
authors.forename: Javier R
authors.initials: JR
authors.lastname: Viguri
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis / Q000737:chemistry*; D057965:Carbon Sequestration; D004784:Environmental Monitoring; D063366:Estuaries; D019015:Geologic Sediments / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000032:analysis* / Q000737:chemistry; D008956:Models, Chemical; D018570:Risk Assessment; D012623:Seawater / Q000737:chemistry*; D013030:Spain; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide