Mobilization of As, Fe, and Mn from Contaminated Sediment in Aerobic and Anaerobic Conditions: Chemical or Microbiological Triggers?
Mobilization of As, Fe, and Mn from Contaminated Sediment in Aerobic and Anaerobic Conditions: Chemical or Microbiological Triggers?
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DOI：
10.1021/acsearthspacechem.1c00370
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发表时间：
2022-07-21
影响因子：
3.4
通讯作者：
Cerrato, Jose M.
中科院分区：
文献类型：
--
作者：
DeVore, Cherie L.;Rodriguez-Freire, Lucia;Villa, Noelani;Soleimanifar, Maedeh;Gonzalez-Estrella, Jorge;Ali, Abdul Mehdi S.;Lezama-Pacheco, Juan;Ducheneaux, Carlyle;Cerrato, Jose M.
我们整合了水化学、光谱学和微生物学技术，以确定影响暴露于好氧和厌氧条件的污染沉积物中砷 (As)、铁 (Fe) 和锰 (Mn) 释放的化学和微生物过程。这些沉积物是从南达科他州夏延河苏族部落土地上收集的，该地区几十年来一直在处理采矿遗留问题。从污染沉积物中测得的总砷浓度范围为 96 至 259 mg kg−1，与 Fe (21 000–22 005 mg kg−1) 和 Mn (682–703 mg kg−1) 共存。从有氧到厌氧氧化还原条件的转变产生了最高的微生物多样性，并且在批量实验中释放出最高浓度的As、Fe和Mn，与外源电子供体（葡萄糖）发生反应。当从有氧条件转变为厌氧条件时，XANES 分析证实了 As 的减少。相比之下，与用葡萄糖修正的实验相比，与磷酸盐反应后释放的 As、Fe 和 Mn 至少低 1 个数量级。我们的结果表明，用外源电子供体修正的矿山废弃沉积物会引发厌氧呼吸引起的微生物还原溶解。这些溶解过程会影响氧化还原梯度中从需氧条件过渡到厌氧条件的系统中的金属迁移。我们的结果与自然系统、地表水和地下水交换或金属循环受化学和生物过程影响的其他系统相关。
We integrated aqueous chemistry, spectroscopy, and microbiology techniques to identify chemical and microbial processes affecting the release of arsenic (As), iron (Fe), and manganese (Mn) from contaminated sediments exposed to aerobic and anaerobic conditions. The sediments were collected from Cheyenne River Sioux Tribal lands in South Dakota, which has dealt with mining legacy for several decades. The range of concentrations of total As measured from contaminated sediments was 96 to 259 mg kg−1, which co-occurs with Fe (21 000–22 005 mg kg−1) and Mn (682–703 mg kg−1). The transition from aerobic to anaerobic redox conditions yielded the highest microbial diversity, and the release of the highest concentrations of As, Fe, and Mn in batch experiments reacted with an exogenous electron donor (glucose). The reduction of As was confirmed by XANES analyses when transitioning from aerobic to anaerobic conditions. In contrast, the releases of As, Fe and Mn after a reaction with phosphate was at least 1 order of magnitude lower compared with experiments amended with glucose. Our results indicate that mine waste sediments amended with an exogenous electron donor trigger microbial reductive dissolution caused by anaerobic respiration. These dissolution processes can affect metal mobilization in systems transitioning from aerobic to anaerobic conditions in redox gradients. Our results are relevant for natural systems, for surface and groundwater exchange, or other systems in which metal cycling is influenced by chemical and biological processes.
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影响因子：
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