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http://hdl.handle.net/2122/7159
Authors: | D'Alessandro, W.* Bellomo, S.* Brusca, L.* Karakazanis, S.* Kyriakopoulos, K.* Liotta, M.* |
Editors: | Lambrakis, N. Stournaras, G. Katsanou, K. |
Title: | The impact on water quality of the high carbon dioxide contents of the groundwater in the area of Florina (N. Greece) | Issue Date: | 2011 | ISBN: | 978-3-642-24075-1 | Keywords: | Groundwater Water quality carbon dioxide trace elements |
Subject Classification: | 03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring 03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters 03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases |
Abstract: | Gas and water samples were collected at CO2-rich wells in the plain of Florina (N. Greece). Chemical and isotopic composition of the analysed gases reveals their main crustal origin even if a small but significant contribution of mantle derived gases can be recognized. As a consequence of CO2 dissolution, HCO3- is always the main dissolved anion while cationic composition allows us to distinguish at least two main groups characterized by Na or Ca as dominant dissolved cations. The water-rock interaction is strongly enhanced by the dissolution of CO2 and the consequent lowering of pH. Such a process increases the mobility of some trace elements whose concentrations very often exceed UE drinking water limits. This study confirms that the Florina basin represents a good natural analogue of carbon storage systems and underscores the fact that possible deterioration of water quality due to CO2 leaks of the reservoirs must be carefully taken in account. |
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