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Elements; April 2006; v. 2; no. 2; p. 97-101; DOI: 10.2113/gselements.2.2.97
© 2006 Mineralogical Society of America
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Arsenic in Soils, Mine Tailings, and Former Industrial Sites

Guillaume Morin and Georges Calas1

1 Institut de Minéralogie et Physique des Milieux Condensés, Université de Paris 6, Université de Paris 7, Institut de Physique
du Globe de Paris et CNRS, Case 115, 4 Place Jussieu, 75252 Paris, France
E-mail: morin{at}impmc.jussieu.fr

Much progress has recently been made on the relation between the crystal chemistry of arsenic and its speciation and distribution at the Earth's surface. The investigation of As-impacted soils and acid mine drainages, using synchrotron-based techniques, shows the importance of As adsorption on, or coprecipitation with, hydrous ferric oxides in delaying the long-term impact of As on the biosphere. Arsenic mobility often depends on bacterial activity, with accompanying major seasonal modifications of As speciation, even at extreme As concentrations. Remediation technologies use geochemical affinities between arsenic and specific low-temperature phases to reduce the bioavailability of arsenic.

KEYWORDS: arsenic, contamination, soils, acid mine drainage, speciation




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