Natural background levels and seasonal influence on groundwater chemistry of the Upper São Francisco karst region, MG, Brazil

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dc.creatorThiago Nogueiralucon
dc.creatorAdivane Terezinha Costa
dc.creatorPaulo Henrique Ferreira Galvão
dc.creatorMariangela Garcia Praça Leite
dc.date.accessioned2023-04-17T22:30:34Z
dc.date.accessioned2025-09-09T00:56:01Z
dc.date.available2023-04-17T22:30:34Z
dc.date.issued2018
dc.identifier.doihttps://doi.org/10.1590/2317-4889201820180071
dc.identifier.urihttps://hdl.handle.net/1843/52113
dc.languagepor
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofDepartment of Geology
dc.rightsAcesso Aberto
dc.subjectBrasil
dc.subjectBacias hidrograficas
dc.subject.otherNatural Background Level
dc.subject.otherSão Miguel watershed
dc.subject.otherArcos
dc.subject.otherPains
dc.subject.otherUpper São Francisco Basin
dc.subject.otherBrazil
dc.titleNatural background levels and seasonal influence on groundwater chemistry of the Upper São Francisco karst region, MG, Brazil
dc.typeArtigo de periódico
local.citation.epage879
local.citation.issue4
local.citation.spage867
local.citation.volume48
local.description.resumoKarst aquifers are large water reservoirs that supply approximately 25% of the world population. They are also extremely sensitive to contamination, demanding knowledge on groundwater quality regarding base level conditions for the main cations and anions. Knowing the Natural Background Level (NBL) values of these waters becomes an indispensable measure to understand aquifers and hydrochemical anomalies, either from anthropogenic or geogenic origin. This paper aimed to provide a hydrochemical characterization and to propose NBL 90% values for the little-studied groundwater of the São Miguel River watershed, Upper São Francisco River, MG, Brazil. NBL 90% values were estimated using statistical analyses followed by an analysis of seasonal influence on observed concentrations. The water was classified as calcium bicarbonate, with the highest NBL 90% values occurring during the rainy season for Ca 2+ , K + , HCO 3 - , SO 4 2- , Cl - , NO 3 - , and As 3+ . On the other hand, Mg 2+ , Na + , PO 4 3- , and Zn 2+ presented reduction in concentration during this season. Nitrate, phosphate and chloride anomalies (values above NBL 90%) are directly related to human action. Thus, monitoring and proposing NBL 90% values were an essential tool to help in understanding the hydrochemical behavior of waters in this watershed.
local.identifier.orcidhttps://orcid.org/0000-0001-9744-2435
local.identifier.orcidhttps://orcid.org/0000-0002-0440-7970
local.identifier.orcidhttps://orcid.org/0000-0001-7183-0368
local.identifier.orcidhttps://orcid.org/0000-0002-9789-3786
local.publisher.countryBrasil
local.publisher.departmentIGC - DEPARTAMENTO DE GEOLOGIA
local.publisher.initialsUFMG
local.url.externahttps://www.scielo.br/j/bjgeo/a/Zt5V7SHQ5v7rnrYDkDnxJ3P/?lang=en

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