Keywords
lead
zinc
chromium
metal toxicity
mining activity
How to Cite
##article.highlights##
- The tolerance of Aspergillus niger to Ag, Cd, Cr, Cu, Hg, Pb and Zn metal salts was determined.
- The fungus showed high tolerance indices (> 0.80) at 1 mM concentrations of each metal salt.
- The minimum inhibitory concentration (MIC) is in the range of 5 to 10 mM of the Hg, Cu and Ag salts, and 15 to 20 mM of the Cd salt.
- The growth of the fungus was not inhibited at 20 mM of the Pb, Zn and Cr salts; therefore, the MIC is even higher.
- Aspergillus niger has potential for bioremediation of the metals evaluated.
Abstract
Introduction: Metal contamination represents a significant risk to ecosystems; it is therefore necessary to reduce the bioavailability, mobility and toxicity of these elements.
Objective: To isolate a filamentous fungus with the ability to tolerate metals.
Materials and methods: The fungus was isolated from soil with mining activity. The tolerance index and the minimum inhibitory concentration (MIC) of the fungus were determined at 1, 5, 10, 15 and 20 mM of the Cd, Hg, Pb, Ag, Cu, Zn and Cr metal salts.
Results and discussion: The isolated fungus was Aspergillus niger. It had average tolerance indices of 0.89, 1.03, 1.05, 0.94, 0.88, 0.87 and 1.27 at 1 mM of the Cd, Hg, Pb, Ag, Cu, Zn and Cr salts, respectively, after seven days of growth at 28 °C. The MIC of A. niger was found in a range of 5 to 10 mM of the Hg, Cu and Ag salts, and 15 to 20 mM of the Cd salt. The Pb, Zn and Cr salts did not inhibit the growth of the fungus with the highest concentration evaluated; that is, the MIC is greater than 20 mM.
Conclusión: Aspergillus niger has potential for the bioremediation of contaminants since it showed high tolerance to the metal salts.
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