Abstract
Bioreduction of the very toxic hexavalent chromium ion [Cr(VI)] to the non-toxic trivalent chromium ion [Cr(III)] is a key remediation process in chromium-contaminated sites. In this study, we investigated the bioreduction of Cr(VI) by Pseudomonas stutzeri L1 and Acinetobacter baumannii L2. The optimum pH (5–10), temperature (27, 37 and 60 °C) and initial chromium Cr(VI) concentration (100–1000 mg L−1) for Cr(VI) reduction by strains L1 and L2 were determined using the diphenylcarbazide method. In the presence of L1 and L2, the bioreduction rate of Cr(VI) was 40–97 and 84–99%, respectively. The bioreduction of Cr(VI) by L2 was higher, reaching up to 84%—than that by L1. The results showed that strain L2 was able to survive even if exposed to 1000 mg L−1 of Cr(VI) and that this tolerance to the effects of Cr(VI) was linked to the activity of soluble enzyme fractions. Overall, A. baumannii L2 would appear to be a potent Cr(VI)-tolerant candidate for the bioremediation of chromium (VI)-contaminated wastewater effluent.
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Acknowledgements
This study was financially supported by Department of Biotechnology (Government of India) in the form of a Ramalingaswami re-entry Fellowship (BT/RLF/Re-entry/17/2012) and the University Grants Commission-MRP (MRP-MAJOR-MICRO-2013-31825). We thank Dr. K. Ravichandran, Associate Professor, Department of English, Thiruvalluvar University, Vellore for his assistance during manuscript preparation.
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Sathishkumar, K., Murugan, K., Benelli, G. et al. Bioreduction of hexavalent chromium by Pseudomonas stutzeri L1 and Acinetobacter baumannii L2. Ann Microbiol 67, 91–98 (2017). https://doi.org/10.1007/s13213-016-1240-4
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DOI: https://doi.org/10.1007/s13213-016-1240-4