Metal mobility and toxicity to microalgae associated with acidification of sediments: CO₂ and acid comparison

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• 作者：M.R. De Orte^a ; ^{manoela.romano@uca.es" class="auth_mail} ; A.T. Lombardi^b ; A.M. Sarmiento^a ; ^c ; M.D. Basallote^a ; A. Rodriguez-Romero^d ; I. Riba^a ; A. Del Valls^a
• 关键词：Carbon capture and storage (CCS) ; Acidification ; Metal mobility ; Microalgae ; Toxicity
• 刊名：Marine Environmental Research
• 出版年：May, 2014
• 年：2014
• 卷：96
• 期：Complete
• 页码：136-144
• 全文大小：729 K

文摘

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.