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Mineralogical Magazine; February 2008; v. 72; no. 1; p. 429-431; DOI: 10.1180/minmag.2008.072.1.429
© 2008 Mineralogical Society of Great Britain and Ireland
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Session 5: Contaminated environments, toxicology and human health

Efficiences of As uptake from aqueous solution by a natural vivianite material at 4°C

K. A. Hudson-Edwards1, S. Houghton1 and K. G. Taylor2

1 Research School of Earth Sciences at UCL-Birkbeck, University of London, Malet St., London WC1E 7HX, UK
2 Department of Environmental and Geographical Sciences, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK

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

ABSTRACT

Several field and laboratory studies have demonstrated that secondary Fe-bearing minerals such as goethite, lepidocrocite and mackinawite have a high capacity for the uptake of As, but little work has been carried out to examine the capacity of the mineral vivianite [Fe3(PO4)2·8H2O] for this element. We report here preliminary results of an experimental study designed to test the efficiency of As(III) and As(V) uptake by natural vivianite at acid, near-neutral and alkaline pH at T = 4°C, which is representative of Lake Baikal-type environments, where natural vivianite is reported to occur. The vivianite takes up between 0 and 5% As(III), and between 21 and 45% As(V), from 200 ppb solutions of these As species. Further work at 25°C and other solution concentrations, together with characterization of the post-sorption solids, will yield information on the efficiencies and mechanisms of As uptake by natural vivianite.






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