Influence of a CO2 long term exposure on the mobilisation and speciation of metals in soils |
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| Institution: | 1. Institute for Advanced Study of Shenzhen University, China;2. Centre for Innovation on Carbon Capture and Storage (CICCS), Institute of Mechanical, Process and Energy Engineering (IMPEE), Heriot-Watt University, EH14 4AS, United Kingdom;3. School of Geography, University of Nottingham, Nottingham NG7 2RD, United Kingdom;1. Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;2. SUBATECH, Unité Mixte de Recherche 6457, Ecole des Mines de Nantes, CNRS/IN2P3, Université de Nantes, 4 rue Alfred Kastler, BP 20722, 44307 Nantes cedex 03, France;3. AMPHOS21, P. Garcia Ifaria 49-51, Barcelona E-08019, Spain;1. Dpt. Stratigraphy, Complutense University of Madrid, C/José Antonio Novais, 12, 28039 Madrid, Spain;2. IGME, Geological Survey of Spain, C/Ríos Rosas, 23, 28003 Madrid, Spain;3. Museo Comarcal de Daimiel, C/Luis Ruiz de Valdepeñas, 8, 13250 Daimiel, Spain;4. Centro de Estudios y Experimentación de Obras Públicas, C/Alfonso XII, 3-5, 28014 Madrid, Spain;1. Department of Geology, Pernambuco Federal University, Brazil;2. Australian National University, Australia;1. Department of Earth Sciences, University College London, London WC1E 6BT, United Kingdom;2. Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA;3. Laboratory of Seismology and Physics of Earth''s Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China;4. CAS Key Laboratory of Crust–Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China;5. CAS Center for Excellence in Comparative Planetology, USTC, Hefei, Anhui 230026, China;6. Centre for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway;7. National Geophysical Observatory at Mengcheng, USTC, Hefei, Anhui 230026, China |
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| Abstract: | This study investigates the potential risks associated with high levels and long term exposure of carbon dioxide (CO2) on the mobility and speciation of exchangeable metals in soils. CO2 incubation batch experiments at high pressure and temperature coupled with geochemical modelling were carried out to elucidate the behaviour and mobilisation of metals and the response of soil chemical parameters as a result of long term CO2 exposure. A t-Student analysis was performed to ascertain whether differences in the mean concentration of exchangeable metals in soils before and after CO2-incubations are attributable to increase of metal molibilisation because of the long term CO2 exposure. The t-Student revealed the CO2 long term incubation was statistically significant (p < 0.05) for the exchangeable concentration of Ni, Zn, and Pb. The CO2-soil incubation induces the acidification of the pore water of soils via CO2 hydrolysis and as a consequence, it increases the exchangeable concentration of Ni, Zn, and Pb in the soils. As, Al, Cr, Cu, and Fe show a different mobilisation pattern depending on the moisture content in soils. Al3+, Fe2+, Cr3+, and Cu2+ as free cations, As as HAsO2, Pb2+and PbHCO3?, Zn2+ and ZnHCO3?, are predicted to be the predominant aqueous complexes in the pore water of the incubated soils. |
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| Keywords: | Acidification Exchangeable metals Soil pore water |
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