Multiple Effects of Humic Components on Microbially Mediated Iron Redox Processes and Production of Hydroxyl Radicals
文献类型：期刊论文
| 作者 | Han, Ruixia ; Wang, Zhe; Lv, Jitao; Zhu, Zhe; Yu, Guang-Hui; Li, Gang; Zhu, Yong-Guan
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| 刊名 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2022 |
| 卷号 | 56期号:22页码:1-9 |
| 关键词 | soil organic matter hydroxyl radical iron reactive oxygen species redox cycle dissimilatory iron-reducing bacteria |
| ISSN号 | 0013-936X |
| 英文摘要 | Microbially mediated iron redox processes are of great significance in the biogeochemical cycles of elements, which are often coupled with soil organic matter (SOM) in the environment. Although the influences of SOM fractions on individual reduction or oxidation processes have been studied extensively, a comprehensive understanding is still lacking. Here, using ferrihydrite, Shewanella oneidensis MR-1, and operationally defined SOM components including fulvic acid (FA), humic acid (HA), and humin (HM) extracted from black soil and peat, we explored the SOM-mediated microbial iron reduction and hydroxyl radical (center dot OH) production processes. The results showed that the addition of SOM inhibited the transformation of ferrihydrite to highly crystalline iron oxides. Although FA and HA increased Fe(II) production over four times on average due to complexation and their high electron exchange capacities, HA inhibited 30-43% of the center dot OH yield, while FA had no significant influence on it. Superoxide (O2 center dot-) was the predominant intermediate in center dot OH production in the FA-containing system, while one-and two-electron transfer processes were concurrent in HA-and HM-containing systems. These findings provide deep insights into the multiple mechanisms of SOM in regulating microbially mediated iron redox processes and center dot OH production. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/48503]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 作者单位 | 1.University of Nottingham Ningbo China 2.Chinese Academy of Sciences 3.Institute of Urban Environment, CAS 4.Institute of Soil Science, CAS 5.Research Center for Eco-Environmental Sciences (RCEES) 6.Tianjin University |
| 推荐引用方式 GB/T 7714 | Han, Ruixia,Wang, Zhe,Lv, Jitao,et al. Multiple Effects of Humic Components on Microbially Mediated Iron Redox Processes and Production of Hydroxyl Radicals[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2022,56(22):1-9. |
| APA | Han, Ruixia.,Wang, Zhe.,Lv, Jitao.,Zhu, Zhe.,Yu, Guang-Hui.,...&Zhu, Yong-Guan.(2022).Multiple Effects of Humic Components on Microbially Mediated Iron Redox Processes and Production of Hydroxyl Radicals.ENVIRONMENTAL SCIENCE & TECHNOLOGY,56(22),1-9. |
| MLA | Han, Ruixia,et al."Multiple Effects of Humic Components on Microbially Mediated Iron Redox Processes and Production of Hydroxyl Radicals".ENVIRONMENTAL SCIENCE & TECHNOLOGY 56.22(2022):1-9. |
入库方式： OAI收割
来源：生态环境研究中心
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