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Laboratory simulation of CO2 leakages during injection and storage in sub-seabed geological formations: metal accumulation and toxicity in the model benthic organisms Hediste diversicolor and Ruditapes philippinarum

AuthorsRodríguez-Romero, Araceli ; Jiménez-Tenorio, Natalia; Riba, Inmaculada ; Blasco, Julián
Issue DateNov-2014
Citation6th Bilateral Seminar Italy-Japan (2014)
AbstractThe CO2 capture and storage in sub-seabed geological formations is proposed as one of thc potential options to decrease the atmospheric CO2 concentrations. However, possible CO2 leakages could occur during the injection and sequestration procedure, provoking significant repercussions on marine environment. We investiga te, the effe ts of acidification derived from CO2 leakage in the benthic model organisms Hediste diversicolor and Ruditapes philippinarurn. To this end, to independent lab scale experiments involving direct release of CO2 were conducted at possible expected scenarios of pH values between 8.0 and 6.1. Individuals of both species were independently exposed during 10 days lo seawater with sediment samples collected in two different coastal areas, one relatively uncontaminated sediment as reference (RSP) and the other with known contaminated sediment (ML). Survival rate and metal accumulation (Fe, Al, Mn, Cu and Zn) on whole body were employed as endpoint. Furthermore, burrowing activity and histopathological damages were quantified for R. philippinarum. Highly significant associations were observed between pH and the biological effects measured in R philippinarum, exccpt for metal concentrations in tissues. However, for H. diversicolor, mortality was only significant at the lowest pH level in the contaminated sediment andan increase in metal uptake by worms exposed to the contaminated sediment was observed in line with the r duction of pH, Those findings may indicate that bivalves are more vulnerable than polychaetes when they are subjected to possible acidification scenarios caused by C02 leakages.
DescriptionTrabajo presentado en el 6th Bilateral Seminar Italy-Japan (BIMAT 2014, "Physical and Chemical Impacts on Marine Organisms Supporting Blue Growth in meaningful mutual symbiosis with the marine environment"), celebrado en Palermo el 19 y 20 de noviembre de 2014.
Appears in Collections:(ICMAN) Comunicaciones congresos
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