Hydrochemical relationships in groundwater from central São Paulo State, Brazil
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Data
2005-05-01
Autores
Tonetto, E. M.
Bonotto, Daniel Marcos [UNESP]
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Editor
Springer
Resumo
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 (pH(average) = 5.9) and have lower values for total dissolved solids (TDSaverage = 105 mg/L) than those obtained for waters leaching Paleozoic sediments of Tubarao 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 Ra-226 indicated the need of a broad radiometric survey in the area.
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hydrochemistry, water quality, water-rock interaction, aquifers at central São Paulo State in Brazil, Rio Claro city and adjacent municipalities
Como citar
Environmental Geology. New York: Springer, v. 47, n. 7, p. 942-955, 2005.