Potential ecotoxicological effects of elevated bicarbonate ion concentrations on marine organisms

Highlights

• Ecotoxicological effects of elevated DIC were evaluated using 10 marine organisms.
• Species-specific toxicity of elevated DIC were found with EC50 of 11–85 mM.
• Mortality for copepod T. japonicus was the most sensitive endpoint for DIC toxicity.
• Tentative criteria of DIC for protecting 80% of marine organisms is 11 mM.

Abstract

Recently, a novel method for carbon capture and storage has been proposed, which converts gaseous CO2 into aqueous bicarbonate ions (HCO3-), allowing it to be deposited into the ocean. This alkalinization method could be used to dispose large amounts of CO2 without acidifying seawater pH, but there is no information on the potential adverse effects of consequently elevated HCO3- concentrations on marine organisms. In this study, we evaluated the ecotoxicological effects of elevated concentrations of dissolved inorganic carbon (DIC) (max 193 mM) on 10 marine organisms. We found species-specific ecotoxicological effects of elevated DIC on marine organisms, with EC50-DIC (causing 50% inhibition) of 11-85 mM. The tentative criteria for protecting 80% of individuals of marine organisms are suggested to be pH 7.8 and 11 mM DIC, based on acidification data previously documented and alkalinization data newly obtained from this study. Overall, the results of this study are useful for providing baseline information on ecotoxicological effects of elevated DIC on marine organisms. More complementary studies are needed on the alkalinization method to determine DIC effects on seawater chemistry and marine organisms.

Gim B-M., Hong S., Lee J-S., Kim N-H., Kwon E-M., Gil J-W., Jeon E-C. & Khim J. S., 2018. Potential ecotoxicological effects of elevated bicarbonate ion concentrations on marine organisms. Environmental Pollution 241: 194-199. Article (subscription required).

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