Bioreduction of hexavalent chromium by Pseudomonas stutzeri L1 and Acinetobacter baumannii L2

被引：0
作者：
Kuppusamy Sathishkumar
Kadarkarai Murugan
Giovanni Benelli
Akon Higuchi
Aruliah Rajasekar
机构：
[1] Thiruvalluvar University,Department of Biotechnology, Environmental Molecular Microbiology Research Laboratory
[2] Bharathiar University,Division of Entomology, Department of Zoology, School of Life Sciences
[3] Thiruvalluvar University,Department of Agriculture, Food and Environment
[4] University of Pisa,Department of Chemical and Materials Engineering
[5] National Central University,undefined
来源：
Annals of Microbiology | 2017年 / 67卷
关键词：
Hexavalent chromium; Diphenylcarbazide; Bioremediation; Trivalent chromium;
D O I：
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中图分类号：
学科分类号：
摘要：
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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页码：91 / 98
页数：7
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