Influence of environmental and anthropogenic factors at the bottom sediments in a Doce River tributary in Brazil.
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2017
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Resumo
In developing countries, it is uncommon to find
watersheds that have been the object of detailed environmental
studies. It makes the assessment of the magnitude of environmental
impacts and pollution of these sites difficult. This
research demonstrated ways to understand the dynamics of
river bottom sediments contamination, even for watersheds
with a lack of environmental data. Based on geochemical
affinity, we conducted a comprehensive study on the concentration
of metals and metalloids. Then, we discussed the probable
origin of the concentration of these elements at the bottom
sediment along the Matipó River. The Matipó River is an
important tributary of the Doce River, which stood out in
international headlines because of the mining tailing dam disaster
in Mariana, Minas Gerais, in 2015. The bottom sediment
samples were taken in 25 stations located along the basin
in different seasonal periods. The results showed that copper
(x = 464.7 mg kg−1) and zinc (x = 287.7 mg kg−1) probably
have natural origin, despite of the high concentrations. Lead (x
= 28.0mg kg−1), chromium (x = 153.2 mg kg−1), and nickel (x
= 41.8 mg kg−1) also had high concentrations at some
collecting stations, and this probably reflected the local natural
conditions. The bedrock of the studying basin is dominantly
composed of metabasalts and metatonalites interlayered with
calcitic and dolomitic metalimestone. On the other hand, the
concentration was worrisome in stations near human activities,
possibly due to impacts caused by unsustainably agriculture
and livestock.
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Bottom sediments pollution, Geochemical affinity, Metals
Citação
REIS, D. A. dos et al. Influence of environmental and anthropogenic factors at the bottom sediments in a Doce River tributary in Brazil. Environmental Science and Pollution Research International, v. 24, p. 7456–7467, 2017. Disponível em: <https://link.springer.com/article/10.1007%2Fs11356-017-8443-5>. Acesso em: 25 ago. 2017.