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| Effects of DFeRB and SRB on the reduction of iron-sulfur during the ice-bound period |
| Received:January 21, 2020 |
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| KeyWord:ice-bound period;DFeRB;SRB;bioactivity;iron-sulfur reduction;coupling effect |
| Author Name | Affiliation | E-mail | | SONG Wen-jie | Pioneer College, Inner Mongolia University, Hohhot 010021, China | | | SHI Wen-jing | School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China | | | Lü Xiang-meng | School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China | | | Lü Si-jie | School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China | | | Lü Chang-wei | School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China | | | HE Jiang | School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China | ndjhe@imu.edu.cn |
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| Abstract: |
| The reduction of iron and sulfur has an important impact on the environmental geochemical behavior of carbon, nitrogen, and phosphorus as well as the species and bioavailability of pollutants such as heavy metals, while microorganisms play a key role in the iron and sulfur reduction process. Based on the characteristics of the long ice-bound period in the cold regions of northern China, this work focuses on the effects of dissimilatory iron-reducing bacteria -(DFeRB -)and sulfate-reducing bacteria(SRB)-mediated reduction processes on the behavior of iron-sulfur during the ice-bound period as well as the coupling relationship of iron-sulfur reduction using simulation studies in the laboratory. The results showed that DFeRB and SRB affected the electron transfer of iron and sulfur when both elements coexisted in the system, making the reduction process of iron and sulfur more complicated. In addition, the reduction tendencies of DFeRB and SRB were obviously different. DFeRB was more favorable for the dissimilatory reduction of iron when iron and sulfur coexisted in the system, and the effect of DFeRB on iron was stronger than that of SRB. Iron and reducing bacteria(DFeRB or SRB) promoted sulfate reduction more strongly when they existed simultaneously. Dissimilatory iron reduction and sulfur reduction mediated by DFeRB and SRB exhibited an obvious coupling relationship and a significant stage difference. DFeRB and SRB retained certain bioactivity and reducibility even during the ice-bound period, and obviously promoted the reduction process of iron and sulfur. |
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