Formation of Soluble Mercury Oxide Coatings: Transformation of Elemental Mercury in Soils.
Formation of Soluble Mercury Oxide Coatings: Transformation of Elemental Mercury in Soils.
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DOI：
10.1021/acs.est.5b00263
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发表时间：
2015-10
影响因子：
11.4
通讯作者：
Carrie L. Miller;D. Watson;B. Lester;J. Howe;D. Phillips;Feng He;L. Liang;E. Pierce
中科院分区：
文献类型：
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作者：
Carrie L. Miller;D. Watson;B. Lester;J. Howe;D. Phillips;Feng He;L. Liang;E. Pierce
汞对人类和生态健康的影响早在几十年前就已为人所知。尽管147个国家在2013年签署了一项条约，对未来的大规模汞排放进行监管，但遗留下来的汞污染在全球范围内都存在，小规模排放将继续下去。元素汞(0)流失到地下的命运及其可能导致形态和迁移性变化的化学转化目前还知之甚少。在这里，我们证明了汞(0)微珠与土壤或氧化锰固体相互作用，X射线光谱分析表明，可溶汞涂层为HGO。溶解研究表明，在与复合土壤反应后，涂层水珠释放到水中的汞比纯液体水银水珠多20倍。一个更大的，>；700倍，发生释放从包裹的汞(0)小球已经反应，这表明，锰氧化物参与了汞(0)小球的转变和可溶汞涂层的形成。虽然涂层可以抑制汞(0)的蒸发，但涂层的高溶解度可以促进汞(II)从汞(0)溢出部位的迁移，并导致土壤中汞形态的潜在变化和汞移动性的增加。
The impact of mercury (Hg) on human and ecological health has been known for decades. Although a treaty signed in 2013 by 147 nations regulates future large-scale mercury emissions, legacy Hg contamination exists worldwide and small-scale releases will continue. The fate of elemental mercury, Hg(0), lost to the subsurface and its potential chemical transformation that can lead to changes in speciation and mobility are poorly understood. Here, we show that Hg(0) beads interact with soil or manganese oxide solids and X-ray spectroscopic analysis indicates that the soluble mercury coatings are HgO. Dissolution studies show that, after reacting with a composite soil, >20 times more Hg is released into water from the coated beads than from a pure liquid mercury bead. An even larger, >700 times, release occurs from coated Hg(0) beads that have been reacted with manganese oxide, suggesting that manganese oxides are involved in the transformation of the Hg(0) beads and creation of the soluble mercury coatings. Although the coatings may inhibit Hg(0) evaporation, the high solubility of the coatings can enhance Hg(II) migration away from the Hg(0)-spill site and result in potential changes in mercury speciation in the soil and increased mercury mobility.