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Pleurotus strains with remediation potential to remove toxic metals from Doce River contaminated by Samarco dam mine

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Abstract

The disaster caused by the rupture of the Samarco tailings dam affected several Brazilian cities and created environmental and economic problems for the Doce River basin. For this reason, the aim of this study was to investigate the use of Pleurotus strains in the removal of toxic metals from the water of the Doce River. Aluminium, arsenic, barium, beryllium, bismuth, cadmium, caesium, lead, cobalt, copper, chromium, indium, iron, lithium, magnesium, manganese, mercury, nickel, silver, selenium, strontium, thallium, uranium, vanadium and zinc in Doce River water samples were quantified by inductively coupled plasma mass spectrometry. Three Pleurotus strains were tested for their capacity to remove potentially toxic metals from these water samples. In addition, Ames test was performed to verify the mutagenic potentials of these samples. Initially, the Doce River water samples showed high concentrations of aluminium, arsenic, barium, lead, iron, magnesium and manganese. But, the analyses from the batch system indicated that Pleurotus efficiently reduced lead (97%), iron (96%), aluminium (95%), manganese (92%), arsenic (87%) and barium (61%). The Ames test indicated that water samples treated with the fungal strains showed decreased mutagenicity. Studies on the contact time effect showed that the peak metal elimination was achieved between 12 and 24 h after fungal inoculation for most of the metals evaluated with a tendency to stabilize during the subsequent period for the elements aluminium, arsenic, barium, iron and lead. Thus, the results indicate that these Pleurotus strains have a biotechnological potential in bioremediation of contaminated or degraded sites.

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Acknowledgements

The authors are grateful to CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and FAPEMIG (Fundação de Amparo à Pesquisa do Estado de Minas Gerais) for financial support (APQ-01540-16).

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by M. P.O. Santos, M. V. N. Santos and R. S. Matos. Formal analysis and investigation of metals concentrations were performed by J. L. Rodrigues and B. L. Batista. Formal analyses of mutagenic experiments were performed by M. C. S. Faria. The statistical analyses were performed by A. S. Van Der Maas. M. P.O. Santos, M. V. N. Santos and R. S. Matos wrote the main manuscript text. C. A. Bomfeti supervised the experiments, edited and reviewed the manuscript. All authors read and approved the final manuscript.

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Correspondence to C. A. Bomfeti.

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The authors have no conflicts of interest to declare that are relevant to the content of this article.

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Editorial responsibility: Hari Pant.

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Santos, M.P.O., Santos, M.V.N., Matos, R.S. et al. Pleurotus strains with remediation potential to remove toxic metals from Doce River contaminated by Samarco dam mine. Int. J. Environ. Sci. Technol. 19, 6625–6638 (2022). https://doi.org/10.1007/s13762-021-03597-4

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  • DOI: https://doi.org/10.1007/s13762-021-03597-4

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