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

Nenhuma Miniatura Disponível

Data

2018

Título da Revista

ISSN da Revista

Título de Volume

Editor

Resumo

Karst 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 Ca2+, K+, HCO3 -, SO4 2-, Cl-, NO3 -, and As3+. On the other hand, Mg2+, Na+, PO4 3-, and Zn2+ 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.

Descrição

Palavras-chave

São Miguel watershed, Arcos, Pains, Karst aquifers, Upper São Francisco Basin

Citação

LUCON, T. N. et al. Natural background levels and seasonal influence on groundwater chemistry of the Upper São Francisco karst region, MG, Brazil. Brazilian Journal of Geology, v. 48, p. 867-879, 2018. Disponível em: <http://www.scielo.br/pdf/bjgeo/v48n4/2317-4692-bjgeo-48-04-867.pdf>. Acesso em: 11 fev. 2019.

Avaliação

Revisão

Suplementado Por

Referenciado Por