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Hydrochemical relationships in groundwater from central São Paulo State, Brazil

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Environmental Geology

Abstract

Groundwater samples from different aquifers occurring at center/northeast portion of São Paulo State, Brazil, were collected and chemically analyzed. The waters leaching Mesozoic sediments are generally more acid (pHaverage=5.9) and have lower values for total dissolved solids (TDSaverage=105 mg/L) than those obtained for waters leaching Paleozoic sediments of Tubarão Group. First-degree trend surfaces revealed that the deeper tubular wells occur towards east/southeast and exploit Paleozoic sediments as well fractured/fissured diabases/basalts, whereas the tubular wells in the west/northwest region are shallower. Piper diagrams indicated that the majority of the waters are a blend of waters from different lithologies. Significant correlations were found among nitrate, chloride and bicarbonate, suggesting the occurrence of some anthropogenic inputs, whereas elevated alpha activity of geogenic 226Ra indicated the need of a broad radiometric survey in the area.

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Acknowledgments

The authors thank FAPESP (Foundation for Supporting Research in São Paulo State) for a PhD scholarship and financial support.

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  1. Instituto de Geociências e Ciências Exatas (IGCE), Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Avenida 24-A No. 1515, P.O. Box 178, 13506-900, Rio Claro, São Paulo, Brazil

    É.M. Tonetto & D. M. Bonotto

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  1. É.M. Tonetto
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  2. D. M. Bonotto
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Correspondence to D. M. Bonotto.

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Tonetto, É., Bonotto, D.M. Hydrochemical relationships in groundwater from central São Paulo State, Brazil. Environ Geol 47, 942–955 (2005). https://doi.org/10.1007/s00254-005-1224-3

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