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O chumbo na Província Mineira do Quadrilátero Ferrífero, Brasil: mapeamento geoquímico e valores de referência
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Abstract(s)
RESUMO: A crescente industrialização associada à expansão da mineração tem proporcionado a poluição dos reservatórios ambientais, dentre os quais o Pb se destaca pelo seu caráter neurotóxico. No Quadrilátero Ferrífero, Minas Gerais, Brasil, o Pb ocorre principalmente associado ao Fe, que possui ampla distribuição e altas concentrações na região. Nesse contexto, um estudo regional realizou a coleta e análise de 541 amostras de águas superficiais e sedimentos de corrente em trechos de bacias de 3a ordem em toda a área. As concentrações de Pb nos sedimentos variaram de 1 a 107 mg.kg-1, com valor de referência de 59 mg.kg-1 com base na metodologia boxplot Upper Inner Fence (UIF). Nas águas superficiais, o Pb apresentou valor mediano de 8,3 μg.L-1, consideravelmente superior ao observado na Europa. A maior parte das anomalias foi encontrada está associada a determinados tipos litológicos (filitos e itabirites) e a locais impactados pela mineração.
ABSTRACT: The growing industrialization associated with mining expansion is responsible for the pollution of environmental reservoirs, among which Pb stands out due to its neurotoxic character. In the Iron Quadrangle, Minas Gerais, Brazil, Pb occurs mainly associated with Fe, which has a wide distribution and high concentrations in the region. In this context, a regional study carried out involved the collection and analysis of 541 samples of surface water and stream sediments in stretches of third-order basins throughout the entire area. Pb concentrations in stream sediments ranged from 1 to 107 mg.kg-1, with a reference value of 59 mg.kg-1 based on the boxplot Upper Inner Fence (UIF) methodology. In surface waters, Pb had a median value of 8.3 μg.L-1, considerably higher than that observed in Europe. Most of the anomalies found are associated with certain lithological types (phyllites and itabirites) and sites impacted by mining.
ABSTRACT: The growing industrialization associated with mining expansion is responsible for the pollution of environmental reservoirs, among which Pb stands out due to its neurotoxic character. In the Iron Quadrangle, Minas Gerais, Brazil, Pb occurs mainly associated with Fe, which has a wide distribution and high concentrations in the region. In this context, a regional study carried out involved the collection and analysis of 541 samples of surface water and stream sediments in stretches of third-order basins throughout the entire area. Pb concentrations in stream sediments ranged from 1 to 107 mg.kg-1, with a reference value of 59 mg.kg-1 based on the boxplot Upper Inner Fence (UIF) methodology. In surface waters, Pb had a median value of 8.3 μg.L-1, considerably higher than that observed in Europe. Most of the anomalies found are associated with certain lithological types (phyllites and itabirites) and sites impacted by mining.
Description
Keywords
Supergrupo Minas Impacto mineiro Distribuição do Pb Valores de referência Anomalias Minas Supergroup Mining impact Pb distribution Background values Anomalies
Citation
Vicq, R., Valente, T., Leão, L., Leite, M. & Nallini Júnior, H. A. (2025). O chumbo na Província Mineira do Quadrilátero Ferrífero, Brasil: mapeamento geoquímico e valores de referência. In: Comunicações Geológicas, 2025, vol. 112, Fascículo Especial I, pp. 323-327. https://doi.org/10.34637/01gy-ec39
Publisher
LNEG - Laboratório Nacional de Energia e Geologia