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Mineralogical Magazine; February 2008; v. 72; no. 1; p. 425-427; DOI: 10.1180/minmag.2008.072.1.425
© 2008 Mineralogical Society of Great Britain and Ireland
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Session 5: Contaminated environments, toxicology and human health

Geochemistry of arsenic (As) in spring and stream waters from San Antonio de los Cobres, NW Argentina

K. A. Hudson-Edwards* and J. Archer

Research School of Earth Sciences at UCL-Birkbeck, University of London, Malet St., London WC1E 7HX, UK

* E-mail: k.hudson-edwards{at}bbk.ac.uk

ABSTRACT

Spring and stream waters from the San Antonio de los Cobres area in NW Argentina have high concentrations of arsenic (As) (151–9490 µg l–1), of which AsV varies widely (6–~100% of total As). Arsenic concentrations correlate with Na, K, Cl, HCO3, B and Li, which are high in the spring waters and are typical of geothermal areas world-wide. Springs near San Antonio supply large amounts of As to the Rio San Antonio de los Cobres (up to 1180 µg l–1), but these concentrations decline to 400 µg l–1 within 10 km of the spring inputs, due to dilution and mineral precipitation.






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