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Kawashima K, Márquez RA, Son YJ, Guo C, Vaidyula RR, Smith LA, Chukwuneke CE, Mullins CB. Accurate Potentials of Hg/HgO Electrodes: Practical Parameters for Reporting Alkaline Water Electrolysis Overpotentials. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Kenta Kawashima
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Raúl A. Márquez
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Yoon Jun Son
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Clarissa Guo
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Rinish Reddy Vaidyula
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Lettie A. Smith
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | | | - C. Buddie Mullins
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
- Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
- Center for Electrochemistry, The University of Texas at Austin, Austin, Texas 78712, United States
- H2@UT, The University of Texas at Austin, Austin, Texas 78712, United States
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Miller CL, Watson DB, Lester BP, Howe JY, Phillips DH, He F, Liang L, Pierce EM. Formation of Soluble Mercury Oxide Coatings: Transformation of Elemental Mercury in Soils. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:12105-12111. [PMID: 26389816 DOI: 10.1021/acs.est.5b00263] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
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.
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Affiliation(s)
- Carrie L Miller
- Environmental Sciences Division, Oak Ridge National Laboratory (ORNL) , Oak Ridge, Tennessee 37831, United States
- Troy University , Troy, Alabama 36082, United States
| | - David B Watson
- Environmental Sciences Division, Oak Ridge National Laboratory (ORNL) , Oak Ridge, Tennessee 37831, United States
| | - Brian P Lester
- Environmental Sciences Division, Oak Ridge National Laboratory (ORNL) , Oak Ridge, Tennessee 37831, United States
| | - Jane Y Howe
- Environmental Sciences Division, Oak Ridge National Laboratory (ORNL) , Oak Ridge, Tennessee 37831, United States
- Hitachi High Technologies Canada, Incorporated , Toronto, Ontario M9W 6A4, Canada
| | | | - Feng He
- Environmental Sciences Division, Oak Ridge National Laboratory (ORNL) , Oak Ridge, Tennessee 37831, United States
- College of Biological and Environmental Engineering, Zhejiang University of Technology , Hangzhou, Zhejiang 310032, People's Republic of China
| | - Liyuan Liang
- Environmental Sciences Division, Oak Ridge National Laboratory (ORNL) , Oak Ridge, Tennessee 37831, United States
| | - Eric M Pierce
- Environmental Sciences Division, Oak Ridge National Laboratory (ORNL) , Oak Ridge, Tennessee 37831, United States
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Brigante M, Zanini G, Avena M. On the dissolution kinetics of humic acid particles. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2006.07.045] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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