title: Metal mobility and toxicity to microalgae associated with acidification of sediments: CO2 and acid comparison.
abstract: The injection and storage of CO2 into marine geological formations has been suggested as a mitigation measure to prevent global warming. However, storage leaks are possible resulting in several effects in the ecosystem. Laboratory-scale experiments were performed to evaluate the effects of CO2 leakage on the fate of metals and on the growth of the microalgae Phaeodactylum tricornutum. Metal contaminated sediments were collected and submitted to acidification by means of CO2 injection or by adding HCl. Sediments elutriate were prepared to perform toxicity tests. The results showed that sediment acidification enhanced the release of metals to elutriates. Iron and zinc were the metals most influenced by this process and their concentration increased greatly with pH decreases. Diatom growth was inhibited by both processes: acidification and the presence of metals. Data obtained is this study is useful to calculate the potential risk of CCS activities to the marine environment.
authors.affiliation: Departamento de Química-Física, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, UNESCO/UNITWIN Wicop, Polígono Río San Pedro s/n, 11510 Puerto Real, Cádiz, Spain. Electronic address: manoela.romano@uca.es.
authors.forename: M R
authors.initials: MR
authors.lastname: De Orte
authors.affiliation: Departamento de Botânica, Universidade Federal de São Carlos, Rodovia Washington Luis Km 235, 13565-905 São Carlos, Brazil.
authors.forename: A T
authors.initials: AT
authors.lastname: Lombardi
authors.affiliation: Departamento de Química-Física, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, UNESCO/UNITWIN Wicop, Polígono Río San Pedro s/n, 11510 Puerto Real, Cádiz, Spain; Departamento de Geología, F. Ciencias Experimentales, Campus El Carmen, Universidad de Huelva, Avda. Fuerzas Armadas, s/n, 21071 Huelva, Spain.
authors.forename: A M
authors.initials: AM
authors.lastname: Sarmiento
authors.affiliation: Departamento de Química-Física, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, UNESCO/UNITWIN Wicop, Polígono Río San Pedro s/n, 11510 Puerto Real, Cádiz, Spain.
authors.forename: M D
authors.initials: MD
authors.lastname: Basallote
authors.affiliation: Departamento de Ecología y Gestión Costera, Instituto de Ciencias Marinas de Andalucía (CSIC), Campus Río San Pedro, 11510 Puerto Real, Cádiz, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Rodriguez-Romero
authors.affiliation: Departamento de Química-Física, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, UNESCO/UNITWIN Wicop, Polígono Río San Pedro s/n, 11510 Puerto Real, Cádiz, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Riba
authors.affiliation: Departamento de Química-Física, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, UNESCO/UNITWIN Wicop, Polígono Río San Pedro s/n, 11510 Puerto Real, Cádiz, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Del Valls
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry / Q000378:metabolism*; D017377:Diatoms / Q000187:drug effects*; D004784:Environmental Monitoring; D063366:Estuaries; D019015:Geologic Sediments / Q000737:chemistry*; D006851:Hydrochloric Acid / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry / Q000633:toxicity*; D023382:Toxicity Tests, Acute; D014874:Water Pollutants, Chemical / Q000633:toxicity
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide; D006851:Hydrochloric Acid
keywords: Acidification; Carbon capture and storage (CCS); Metal mobility; Microalgae; Toxicity