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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Who to blame for groundwater fluoride anomaly in Sao Paulo, Brazil? Hydrogeochemistry and isotopic evidence

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Author(s):
Martins, Veridiana T. de S. [1] ; Pino, Daphne Silva [2] ; Bertolo, Reginaldo [1] ; Hirata, Ricardo [1] ; Babinski, Marly [3] ; Pacheco, Diego Felipe [4] ; Rios, Ana Paula [2]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Geosci Inst, Sedimentary & Environm Geol Dept, Sao Paulo - Brazil
[2] Univ Sao Paulo, Geosci Inst, Postgrad Studies Program Mineral Resources & Hydr, Sao Paulo - Brazil
[3] Univ Sao Paulo, Geosci Inst, Mineral & Geotecton Dept, Sao Paulo - Brazil
[4] Petrobras SA, Rio De Janeiro, RJ - Brazil
Total Affiliations: 4
Document type: Journal article
Source: APPLIED GEOCHEMISTRY; v. 90, p. 25-38, MAR 2018.
Web of Science Citations: 1
Abstract

Fluoride concentrations up to 10 mg.L-1 have been described in the groundwater of the biggest South American City, Sao Paulo, Brazil. Possible suspects were minerals in crystalline or sedimentary rocks, or industrial activities. Hydrochemistry tools pointed that the fluoride occurrence has positive correlation with Na and HCO3- concentrations and negative correlation with Ca2+. The saturation index are negative for fluorite in all samples, but samples with high fluoride content have calcite saturation index close to zero, indicating the precipitation of calcite maybe a mechanism that is taking out the Ca+2 and enhancing fluorite dissolution. Samples with fluoride concentrations > 1.5 mg.L-1 are related to samples more depleted in H and O heavier isotopes and deeper groundwater flow with higher temperature. This anomaly is probably associated with fluorite dissolution, present in a fault system with an ancient hydrothermal activity, with deep circulation of groundwater flows in the crystalline basement rocks. (AU)

FAPESP's process: 10/20876-0 - Application of Pb, Sr, H and o isotopes as tools for studies of groundwater recharge and contamination in the West zone of São Paulo City, upper Tiete Watershed
Grantee:Veridiana Teixeira de Souza Martins
Support Opportunities: Regular Research Grants
FAPESP's process: 08/08601-5 - Study of strontium, oxygen and hydrogen isotopes in a fluor contamination at São Paulo municipal district
Grantee:Daphne Silva Pino
Support Opportunities: Scholarships in Brazil - Scientific Initiation