Toxicity assessment of nickel using Aspergillus niger and its removal from an industrial effluent |
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Authors: | Rajendran P Ashokkumar B Muthukrishnan J Gunasekaran P |
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Institution: | (1) Department of Microbial Technology, School of Biological Sciences, Madurai Kamaraj University, 625 021 Madurai, India |
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Abstract: | Chemical analysis of electroplating effluent revealed the presence of very high concentrations of nickel (393 ppm) in the
effluent. Bioassay was carried out to test the toxicity of nickel chloride to Aspergillus niger. In contrast to 50% conidial inhibition at 1.7 mM nickel, hyphal extension was affected even at a lower concentration (0.4 mM), suggesting that hyphae are more sensitive than conidia to nickel. An increase in nickel concentration resulted in a proportionate
decrease in the hyphal extension. Nickel (II)-resistant mutants of A. niger M1, M2, and M3, were obtained using direct selection, stepwise adaptation, and ultraviolet mutation techniques. Biosorption
of Ni (II) by the mutant M3 was 50% more than that of its parent strain. |
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Keywords: | Aspergillus niger nickel toxicity bioremediation biosorption |
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