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Authors: D'Alessandro, W.* 
Bellomo, S.* 
Brusca, L.* 
Karakazanis, S.* 
Kyriakopoulos, K.* 
Liotta, M.* 
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 Classification03. 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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