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Peluso F.,Flatlands Hydrology Institute | Peluso F.,Scientific Research Commission of the Buenos Aires Province CIC | Masson I.,Flatlands Hydrology Institute | Masson I.,Scientific Research Commission of the Buenos Aires Province CIC | And 6 more authors.
Human and Ecological Risk Assessment | Year: 2016

The aim of this study was to assess the risk associated with recreational bathing at Del Azul stream, Argentina, a water course naturally containing Arsenic. It represents a case study on the carcinogenic risk for bathers and on how the risk varies among age groups and genders, analyzing the uncertainties of the model input variables and the risk quantification technique. The risk was probabilistically estimated with the 2D Monte Carlo method considering four age groups (5, 10, 15, and 20 years old) and separate exposure routes: accidental water intake, skin contact, and the two combined. Although in all the studied groups the risk levels were within safety limits, differences in risk values were observed among age groups and genders. Accidental water intake during bathing was the most risky exposure route. The risk decreased with age and it was higher in males than in females, with larger differences between the two older age groups. This could be attributed to the difference in the accidental water intake rate associated with the daily duration of the bathing event, which varied according to age and gender. © 2016 Taylor & Francis Group, LLC

Bocanegra E.,University of the Sea | Bocanegra E.,Scientific Research Commission of the Buenos Aires Province CIC | Quiroz Londono O.M.,University of the Sea | Quiroz Londono O.M.,CONICET | And 4 more authors.
Environmental Earth Sciences | Year: 2013

This paper gives an account of the assessment and quantification of the water balance and the hydrogeological processes related to lake-groundwater interaction in the Pampa Plain by using hydrogeochemical, isotopic and flow numerical modeling techniques. La Salada is a permanent shallow lake, with an area of 5. 8 km2, located on the SE of Buenos Aires Province. A total of 29 lake water samples and 15 groundwater samples were collected for both hydrochemical analysis and environmental stable isotope determination. Water table depths were measured in wells closed to the lake. Groundwater samples appear grouped on the Local Meteoric Water Line, suggesting a well-mixed system and that rainfall is the main recharge source to the aquifer. Water evaporation process within La Salada is also corroborated by its isotopic composition. The model that best adjusts to La Salada Lake hydrochemical processes includes evaporation from groundwater, calcite precipitation with CO2 release and cationic exchange. The annual water balance terms for the lake basin indicates for each hydrological component the following values: 1. 16 E08 m3 rainfall, 8. 15 E07 m3 evapotranspiration, 1. 90 E06 m3 runoff, 1. 55 E07 m3 groundwater recharge, 6. 01 E06 m3 groundwater discharge to the lake, 9. 54 E06 m3 groundwater discharge to the river, 5. 00 E05 m3 urban extraction and 4. 90 E06 m3 lake evaporation. Integrated analysis of hydrochemical and isotopic information helped to calibrate the groundwater flow model, to validate the conceptual model and to quantitatively assess the basin water balance. © 2012 Springer-Verlag.

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