Journal
JOURNAL OF ENVIRONMENTAL QUALITY
Volume 48, Issue 2, Pages 439-449Publisher
AMER SOC AGRONOMY
DOI: 10.2134/jeq2018.04.0168
Keywords
-
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG, Foundation of Science and Technology of Minas Gerais state)
- Pro-Reitoria de Extensao da Universidade Federal de Minas Gerais
- Coordenacao de Aperfeicoamento de Pessoal Docente (CAPES)
- FAPEMIG
Ask authors/readers for more resources
The rupture of the Fundao mine dam in Mariana municipality, Minas Gerais State, Brazil, spilled the tailings across the Doce River basin. These tailings, composed of residues discarded from the beneficiation of iron ore, are rich in SiO2 and Al2O3, as well as some ether amine compounds and NaOH. The aim of this study was to assess the distribution of these sediments, as well as their effect on the riparian zones reached, as compared with preserved sites. Sediment deposition in the river resulted in a morphological change from a meandering profile to a braided aspect. The nutrient and mineral content (P, K, Ca, Mg, Cu, Fe, Mn, Zn, and NO3-) and soil organic matter of the sediments were depleted, whereas NH4+, Na, and pH increased. A random presence of ether amines in the sediments was confirmed by quantitative and chromatographic analyses, with concentrations ranging from 0 to 57.8 mg kg(-1); Na reached values as high as 150 mg kg(-1). The impact of the dam tailings on biota was assessed by estimating total microbial biomass (phospholipid fatty acids), which were depleted in sediments relative to soils from preserved sites. Overall plant mortality, as well as a low resilience capacity, were also observed. Ether amines and Na present in the sediments had a strong toxic effect in the environment. Identification of these substances as the main impact factors will help guide future remediation efforts.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available