Hydrochemical relationships in groundwater from central Sao Paulo State, Brazil

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^sub average^=5.9) and have lower values for total dissolved solids (TDS^sub average...

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Bibliographic Details
Published in:Environmental earth sciences 2005-05, Vol.47 (7), p.942-955
Main Authors: TONETTO, E. M, BONOTTO, D. M
Format: Article
Language:English
Subjects:
Anthropogenic factors
Aquifers
Basalt
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Geochemistry
Groundwater
Hydrogeology
Hydrology
Hydrology. Hydrogeology
Leaching
Mesozoic
Mineralogy
Paleozoic
Pollution, environment geology
Sediments
Silicates
Total dissolved solids
Water analysis
Water geochemistry
Water sampling
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Summary: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^sub average^=5.9) and have lower values for total dissolved solids (TDS^sub average^=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 ^sup 226^Ra indicated the need of a broad radiometric survey in the area.[PUBLICATION ABSTRACT]
ISSN:0943-0105
1866-6280
1432-0495
1866-6299
DOI:10.1007/s00254-005-1224-3