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| Isolation, Identification and Cr(Ⅵ)-Reducing Capacity of a Cr(Ⅵ)-Reducing Strain Enterobacterhormaechei |
| Received:April 15, 2015 |
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| KeyWord:Enterobacterhormaechei;chromium(Ⅵ);reducing bacteria;screening and identification |
| Author Name | Affiliation | E-mail | | LI Wei-hong | College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
College of Resources and Environment, Shanxi Agriculture University, Taigu 030801, China | | | YANG Ning | College of Food Science and Engineering, Shanxi Agriculture University, Taigu 030801, China | | | WEI Xiao-feng | College of Food Science and Engineering, Shanxi Agriculture University, Taigu 030801, China | | | YUE Xiu-ping | College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China | | | XU Jian | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | xujian@craes.org.cn |
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| Abstract: |
| Hexavalent chromium Cr(Ⅵ) is a highly toxic and mobile metal species. Reducing Cr(Ⅵ) to Cr(Ⅲ) has been considered to be one of remediation techniques for Cr(Ⅵ)-polluted water or soil. Here one Cr(Ⅵ)-reducing bacterial strain, C2L, was isolated from a Cr(Ⅵ)-polluted soil in Shanxi Province. The strain was identified as Enterobacterhormaechei according to its morphological characteristics, physiological and biochemical reactions, and 16S rDNA sequence analysis. To our knowledge, this is the first report on Cr(Ⅵ) reduction by Enterobacterhormaechei bacterial strain. The reduction of Cr(Ⅵ) occurred over a wide range of pH(5~9) and temperature(25~45 ℃) with the optimum performance at pH 8 and 30 ℃. At the initial Cr(Ⅵ) concentrations of 50 mg·L-1, 100 mg·L-1, 200 mg·L-1, 400 mg·L-1 and 800 mg·L-1, the reduction rates of Cr(Ⅵ) by the C2L strain were 99.3%, 94.2%, 85.6%, 82.1%, and 58.2%, respectively. The strain exhibited Cr(Ⅵ) reduction even at high Cr(Ⅵ) concentrations, suggesting that the strain possessed distinct capability for the Cr(Ⅵ) removal. This strain shows great potential to remediate Cr(Ⅵ)-polluted soils. |
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