Manganese, Arsenic, and Carbonate Interactions in Model Oxic Groundwater Systems.
Manganese, Arsenic, and Carbonate Interactions in Model Oxic Groundwater Systems.
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模型的木质地下水系统中的锰，砷和碳酸盐相互作用。
DOI：
10.1021/acs.est.0c02084
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发表时间：
2020-09-01
影响因子：
11.4
通讯作者：
Ying SC
中科院分区：
文献类型：
--
作者：
Schaefer MV;Plaganas M;Abernathy MJ;Aiken ML;Garniwan A;Lee I;Ying SC
锰和砷都威胁着全球地下水质量，但它们的化学行为导致这些污染物从单个井到区域尺度的共污染和分离。在这里，我们测试了锰和砷的保留条件下常见的含水层氧化还原波动和过渡区，砷和铁相都存在于氧化形式，但锰持续还原和可溶性锰（II）。柱水穿透数据的分析和使用X射线光电子能谱（XPS）和吸收光谱（XAS）的固相产物的表征表明，碳酸氢盐的加入增加了锰的保留，但降低了砷的保留，而锰和砷的存在下一起增加砷和锰的保留。在O2的存在下，砷在所有测量条件下仍然氧化为砷酸盐;然而，还原Mn（II）被氧化为平均Mn氧化态的~3在没有砷酸盐。砷酸盐的存在下，部分抑制锰（II）的氧化可能通过阻止水铁矿表面需要催化锰（II）氧化的O2和通过稳定锰（II）通过三元复合物的形成。这些结果突出了还原和氧化污染物之间的相互作用，可以有助于地下水系统中的锰和砷的共存或物理分离的变化或分层氧化还原条件下。
Manganese and arsenic both threaten groundwater quality globally, but their chemical behavior leads to both co-contamination and separation of these contaminants from individual well to regional scales. Here we tested manganese and arsenic retention under conditions commonly found within aquifer redox fluctuating and transition zones where both arsenic and iron phases are present in oxidized forms, but manganese persists as reduced and soluble Mn(II). Analysis of column aqueous breakthrough data and characterization of solid-phase products using X-ray photoelectron (XPS) and absorption spectroscopies (XAS) show that the addition of bicarbonate increased manganese retention but decreased arsenic retention, while the presence of manganese and arsenic together increased both arsenic and manganese retention. In the presence of O2 arsenic remained oxidized as arsenate under all conditions measured; however, reduced Mn(II) was oxidized to an average Mn oxidation state of ~3 in the absence of arsenate. The presence of arsenate partially inhibited Mn(II) oxidation likely by blocking ferrihydrite surfaces needed to catalyze Mn(II) oxidation by O2 and by stabilizing Mn(II) via ternary complex formation. These results highlight the interactions between reduced and oxidized contaminants that can contribute to the co-occurrence or physical separation of manganese and arsenic in groundwater systems under changing or stratified redox conditions.
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影响因子：
2.8
作者：
Hasan, M. Aziz;Ahmed, K. Matin;Jacks, Gunnar
通讯作者：
Jacks, Gunnar
影响因子：
11.4
作者：
Amstaetter, Katja;Borch, Thomas;Kappler, Andreas
通讯作者：
Kappler, Andreas
影响因子：
56.9
作者：
Michel, F. Marc;Ehm, Lars;Parise, John B.
通讯作者：
Parise, John B.
是时候在饮用水中重新评估锰的指南价值了吗？
影响因子：
10.4
作者：
Ljung K;Vahter M
通讯作者：
Vahter M
长江流域中部含水层沉积物氧化还原诱导砷释放和滞留的实验约束
影响因子：
9.8
作者：
Duan, Yanhua;Schaefer, Michael, V;Fendorf, Scott
通讯作者：
Fendorf, Scott