Journal Title
Title of Journal: Environ Earth Sci
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Abbravation: Environmental Earth Sciences
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Publisher
Springer Berlin Heidelberg
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Authors: Carolina Calvi Daniel Martinez Cristina Dapeña Florencia Gutheim
Publish Date: 2016/03/21
Volume: 75, Issue: 6, Pages: 534-
Abstract
High concentrations of fluoride have negative effects on human health and it is one of the most widespread contaminants in groundwater having being found in high concentrations in different countries over the entire world Fluoride concentrations exceeding the drinking water levels are very frequent in the region known as Pampa Plain in Argentina associated with loesslike sediments bearing volcanic shards and calcium carbonate concretions In this study the behavior of fluoride in the catchment of La Ballenera creek is performed to contribute to the understanding of the processes controlling its distribution at catchment scale The catchment is around 100 km2 mostly in a flat landscape outflowing into the Atlantic Ocean The concentration of major ions silica and fluoride was measured on 34 groundwater and 9 surface water samples obtained in October 2013 All the samples both streamwater and groundwater were sodium bicarbonate type with an average pH of 8 and 73 respectively The fluoride concentrations in groundwater ranged between 11 and 25 mg/L with an average value of 19 mg/L Fluoride concentrations in streamwater were close to groundwater concentrations indicating the predominance of baseflow on surface water composition The variations in the contents of fluoride are due to two main factors one geological–geomorphological and the other geochemical The first one is related to the dominance of loesslike sediments formed by minerals bearing fluoride and the second one is related to the control resulting on calcite precipitation adsorbing fluoride ionsThis study was economic support by grants from INGEIS CONICET PIP0392 and FONCyT PICT120768 The authors are grateful to the Mr Eduardo Llambías CONICETINGEIS for their assistance in logistics and field work Mr Gustavo Bernava staff Laboratory of the Institute of Marine and Coastal Research CONICETUNMPD from the water chemical analyses and Mr Oscar Urruty of Chacra Experimental Miramar for his cooperation
Keywords:
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