222Rn is widely used as a tracer to detect and calculate submarine groundwater discharge in coastal zones, rivers and lakes. Relatively few investigations, however, have used this element for other applications in hydrogeology. We analyze the relationship between 222Rn activity in groundwater and variations in the water cycle in the sandy aquifer of Buenos Aires coast, Argentina. Groundwater levels, electrical conductivity and 222Rn activity were measured in situ in wells in March 2016 and November 2018, representing two different hydrological conditions. Groundwater flow maps were drawn, hydrological gradients and flux velocities were calculated. An inverse correlation between 222Rn activity and recharge conditions was found. Lower water surplus shows higher 222Rn activity and vice versa, potentially due to dilution of high 222Rn activity water with ‘newer’ lower activity recent recharge. A variability in 222Rn spatial distribution was identified along the sand dune barrier. A correlation between 222Rn and groundwater electrical conductivity was not observed.
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This work was supported by the Agencia Nacional de Promoción Científica y Tecnológica, Grant number PICT 2016–2522, 2017–2020 and Universidad Nacional de La Plata, Grant number PPID/N021, 2017–2018. The authors would like to thank the Cooperativa de Provisión de Obras y Servicios Públicos de San Clemente del Tuyú Ltda. for their collaboration as well as the reviewers and editors for the valuable comments that improved the quality of the manuscript.
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Carretero, S., Rapaglia, J., Rodrigues Capítulo, L. et al. Variability of 222Rn in the sandy aquifer of Buenos Aires coast. Environ Earth Sci 80, 109 (2021). https://doi.org/10.1007/s12665-021-09388-x
- Hydrological cycle
- Sand dune barrier
- Buenos Aires