Influence of environmental and anthropogenic factors at the bottom sediments in a Doce River tributary in Brazil

• Published in: Environmental science and pollution research international 2017-03, Vol.24 (8), p.7456-7467
• Main Authors: dos Reis, Deyse Almeida, da Fonseca Santiago, Aníbal, Nascimento, Laura Pereira, Roeser, Hubert Mathias Peter
• Format: Article
• Language: English
• Subjects: Agriculture; Anthropogenic factors; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Bedrock; Bottom sediments; Brazil; Chromium; Contaminated sediments; Contamination; Developing countries; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental impact; Environmental Monitoring; Environmental science; Environmental studies; Geochemistry; Geologic Sediments - chemistry; Heavy metals; Human influences; LDCs; Lead; Livestock; Metal concentrations; Metalloids; Metalloids - analysis; Metals, Heavy - analysis; Mine wastes; Nickel; Research Article; Rivers; Rivers - chemistry; Sediment pollution; Sediment samplers; Sediments; Stations; Tributaries; Waste Water Technology; Water Management; Water Pollutants, Chemical - analysis; Water pollution; Water Pollution Control; Watersheds
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-017-8443-5

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 ¯ = 28.0 mg 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.