De Orte M R, Lombardi A T, Sarmiento A M, Basallote M D, Rodriguez-Romero A, Riba I, Del Valls A
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 Botânica, Universidade Federal de São Carlos, Rodovia Washington Luis Km 235, 13565-905 São Carlos, Brazil.
Mar Environ Res. 2014 May;96:136-44. doi: 10.1016/j.marenvres.2013.10.003. Epub 2013 Oct 11.
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.
将二氧化碳注入海洋地质构造并进行存储，已被提议作为一种缓解全球变暖的措施。然而，存储过程中可能会发生泄漏，从而对生态系统产生多种影响。进行了实验室规模的实验，以评估二氧化碳泄漏对金属归宿以及微藻三角褐指藻生长的影响。收集了受金属污染的沉积物，并通过注入二氧化碳或添加盐酸的方式使其酸化。制备了沉积物淘析液以进行毒性测试。结果表明，沉积物酸化增强了金属向淘析液中的释放。铁和锌是受此过程影响最大的金属，随着pH值降低，它们的浓度大幅增加。硅藻的生长受到酸化和金属存在这两个过程的抑制。本研究获得的数据有助于计算碳捕获与封存活动对海洋环境的潜在风险。
