التفاصيل البيبلوغرافية
| العنوان: |
Integrated environmental assessment of iron ore tailings in floodplain soils and plants after the Fundão Dam disaster in Brazil. |
| المؤلفون: |
Melo, Vander F., Lipski, Bernardo, Motta, Antônio Carlos V., de Pierri, Letícia, Leme, Daniela M., Ercole, Tamires M., D. d. S. Lima, Maria Fernanda, Thá, Emanoela L., Bastos, Leonardo P. |
| المصدر: |
Integrated Environmental Assessment & Management; Jan2024, Vol. 20 Issue 1, p117-132, 16p |
| مصطلحات موضوعية: |
IRON ores, PLANT-soil relationships, METAL tailings, FLOODPLAINS, ONIONS, POTTING soils |
| مصطلحات جغرافية: |
BRAZIL |
| مستخلص: |
Previous studies of the Doce River basin (Brazil) seem to be contradictory regarding the contamination of soils with potentially harmful elements (PHE). This research aimed to perform an integrated assessment of PHE in the soil–plant–tailing system from the area most affected by the iron waste after the Fundão Dam disaster in 2015. Different fractions of PHE (exchangeable, nonexchangeable, reducible, and pseudo‐total) were determined on deposited iron waste (DIW), soil waste mixture (SWM), and control soil (CS) samples. Total contents of PHE in Poaceae were also determined, and Allium cepa bioassays were performed to determine DIW and CS cytotoxicity and/or genotoxicity to plants. The Fe and Mn contaminations were the only ones related to the deposition of DIW on floodplains, and other harmful element content (such as As, Hg, Ni, Cd, Cr, and Pb) was not found above baseline values for soils. In addition, a significant part of the Fe and Mn in DIW is readily available or subject to acidification and prolonged flood reduction processes. The high available content of Fe favored its excessive accumulation by Brachiaria. The DIW chemical conditions reduced biological functions of A. cepa under a controlled environment. However, more drastic effects, such as genetic damage, were not seen. The postdisaster action of covering DIW with CS resulted in undesirable enrichment of Pb on the floodplain soils. The integrated results allow the conclusion that the iron waste is not a time bomb for PHE contamination of soils between the Fundão and Risoleta Neves Hydroelectric Dam (~100 km away from Fundão). Integr Environ Assess Manag 2024;20:117–132. © 2023 SETAC Key Points: There was no contamination of Al, Ag, As, Ba, Cd, Co, Cr, Cu, Hg, Ni, Sb, Se, Sn, Pb, and Zn on deposited iron waste (DIW).Fe and Mn contamination in DIW was found, and Mn was readily bioavailable; high levels of Fe were detected in Brachiaria.Genetic damage assessed by a bioassay with Allium cepa seeds has not been observed.Covering DIW with control soil resulted in undesirable enrichment in Pb on the floodplains. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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