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Effects of iron on arsenic speciation and redox chemistry in acid mine water

January 1, 2005

Concern about arsenic is increasing throughout the world, including areas of the United States. Elevated levels of arsenic above current drinking-water regulations in ground and surface water can be the result of purely natural phenomena, but often are due to anthropogenic activities, such as mining and agriculture. The current study correlates arsenic speciation in acid mine drainage and mining-influenced water with the important water-chemistry properties Eh, pH, and iron(III) concentration. The results show that arsenic speciation is generally in equilibrium with iron chemistry in low pH AMD, which is often not the case in other natural-water matrices. High pH mine waters and groundwater do not always hold to the redox predictions as well as low pH AMD samples. The oxidation and precipitation of oxyhydroxides deplete iron from some systems, and also affect arsenite and arsenate concentrations through sorption processes. ?? 2004 Elsevier B.V. All rights reserved.

Citation Information

Publication Year 2005
Title Effects of iron on arsenic speciation and redox chemistry in acid mine water
DOI 10.1016/j.gexplo.2004.10.001
Authors A.J. Bednar, J.R. Garbarino, J. F. Ranville, T.R. Wildeman
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Geochemical Exploration
Series Number
Index ID 70029119
Record Source USGS Publications Warehouse
USGS Organization