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233 SPRING STREET, NEW YORK, NY 10013 USA
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Environmental Geology, 2005, Vol 48, Issue 11, p. 117-124
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On Ra-226 and Rn-222 concentrations in the brackish waters of coastal aquifers: lab-investigations and confirmation in the carbonate aquifer of Brindisi (Italy)
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Spizzico M. , Sciannamblo D. ,
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Abstract:
The ground waters circulating in the Apulian mesozoic carbonate aquifer, of coastal type, show high concentrations of Rn-222 everywhere. Considering their variation during the different phases of a hydrological year, such high concentration values can reach activity of 20 Bq/L, in the more internal zones of the aquifer. Moreover, it is often observed that, in correspondence of wells and springs nearest the coast, the concentrations of radioactive gas reach values greater than 400 Bq/L and vary considerably during the course of a day and with withdrawals. The research carried out over the last few years, has confirmed that Ra-226 and Rn-222 concentrations in the karst groundwater of Apulia, are mainly related to the occurrence of 'Terra Rossa' inside the aquifer and the capacity of these paleosols to fix the salts of Ra-226 coming from the dissolution of the calcareous and calcareous-dolomitic rocks. This paper shows the results of the analysis performed to define Rn-222 increase in the brackish waters that come in contact with carbonate rocks and 'terra rossa'. It also indicates the results of surveys performed in a coastal zone with well-known hydrogeological features. The controls performed during one hydrological year, have confirmed the relationships between the salt content of the ground waters and the enrichment of Rn-222 and have highlighted that the manner of increase of this radioisotope is related to cases of ionic exchange and adsorption regulated by the dynamics of marine intrusion
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Keywords: activity, adsorption, apulia, aquifer, aquifers, capacity, carbonate, carbonate aquifer, carbonate rock, carbonate rocks, carbonate-aquifer, coast, coastal, coastal aquifer, coastal aquifers, dissolution, dynamics, enrichment, exchange, features, gas, ground water, ground waters, ground-water, groundwater, intrusion, italy, karst, karst groundwater, marine, paleosols, phase, ra-226, reaches, rn-222, rock, rocks, salt, seawater, spring, springs, terra rossa, time, times, values, variation, water, waters, wells, zone, zones,
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