International Science Community Association International Research Journal of Biological Sciences 2278-3202 10 4 2021 12 10 Optimization of operating conditions for biosorption of chromium by Aspergillus niger isolated from contaminated soil 29 33 EN Samuel Onuorah 1 Department of Applied Microbiology and Brewing, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria Dominic Ndumdi 2 Department of Applied Microbiology and Brewing, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria P. Sunil Kumar 1 Department of Zoology, Sree kerala Varma College, Thrissur-680001, India A. Sneha 2 Department of Zoology, Sree kerala Varma College, Thrissur-680001, India Parmar B.M. 1 Central Laboratory, Dudheswar waterworks, Ahmedabad Municipal Corporation, Gujarat, India Revathi S. 1 Department of biotechnology, Government Science College (Autonomous), Bangalore, Karnataka, India Taj Mohsin 2 Department of biotechnology, Government Science College (Autonomous), Bangalore, Karnataka, India Shalini N.S. 3 Department of biotechnology, Government Science College (Autonomous), Bangalore, Karnataka, India Khabade Sarina P. 4 Department of biotechnology, Government Science College (Autonomous), Bangalore, Karnataka, India Shrivastava Shobha 1 SNGGPG College, Bhopal, Madhya Pradesh, India Gupta Mayuri 2 Barkatullah University, Bhopal, Madhya Pradesh, India > Research Paper 2021 7 29 2021 12 10 In recent years, the fungal biomass is used as a biosorbent for the removal of hazardous pollutants and heavy metal ions from various industrial effluents has gotten a lot of attention. The metal tolerant fungal isolates were isolated from the selected polluted sites and screened for their tolerance indices and minimum inhibitory concentration (MIC). The fungal isolate possessing highest tolerance and MIC was identified as Aspergillus niger was further used as a biosorbent to remove hexavalent chromium ions Cr(VI) in this investigation. From the present study, pH 6.0, temperature of 35°C and contact time of 120 minute showed highest removal of 78.8 percent from the aqueous metal solution containing chromium concentration of 150mg/L. The current study discovered that fungus from metal-polluted locations have better metal tolerance and biosorption effectiveness, and hence might be used for heavy metal biosorption. Copyright@ International Science Community Association