Phosphorus behavior in sediments during a sub-seabed CO2 controlled release experiment

Tsukasaki, Ayumi; Suzumura, Masahiro; Lichtschlag, Anna ORCID:; Stahl, Henrik; James, Rachael H.. 2015 Phosphorus behavior in sediments during a sub-seabed CO2 controlled release experiment. International Journal of Greenhouse Gas Control, 38. 102-109.

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© 2015 Elsevier B.V. This is the author’s version of a work that was accepted for publication in International Journal of Greenhouse Gas Control. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version is published in International Journal of Greenhouse Gas Control (doi:10.1016/j.ijggc.2014.12.023)
Tsukasaki et al_phosphorus.pdf - Accepted Version

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The CO2 controlled release experiment “Quantifying and Monitoring Potential Ecosystem Impacts of Geological Carbon Storage” (QICS) assessed the impacts of potential CO2 leakage from sub-seabed carbon capture and storage reservoirs to the marine environment. During QICS, CO2 gas was released into shallow sediment in Ardmucknish Bay, Scotland, in the spring and summer of 2012. As part of this project, we investigated the effects of CO2 leakage on sedimentary phosphorus (P), an essential nutrient for marine productivity. We found no statistically significant effects during QICS, as the solid-phase P content in the sediment was constant before, during, and after exposure to CO2. However, laboratory experiments using marine sediment standard materials as well as QICS sediment revealed substantial differences among these different sediment types in their potential for P release during CO2 exposure. Employing the SEDEX sequential extraction technique to determine the sizes of the major P pools in the sediments, we showed that calcium-bound P can be easily released by CO2 exposure, whereas iron-bound P is a major sink of released P. The overall impacts of CO2 leakage on sediment P behavior appear to be low compared to natural variability.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 17505836
Additional Keywords: Sub-seabed carbon capture and storage; CCS; CO2 leakage; Marine sediment; Phosphorus; Sequential extraction
Date made live: 22 Jun 2015 10:59 +0 (UTC)

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