Aqueous uptake of uranium onto pyrite surfaces; reactivity of fresh versus weathered material

Details Aqueous uptake of uranium onto pyrite surfaces; reactivity of fresh versus weathered material Aqueous uptake of uranium onto pyrite surfaces; reactivity of fresh versus weathered material

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.5044s&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 71, Issue 21, p. 5044-5053.

Physics

1

Scientific paper

In order to better understand the interaction between aqueous uranium and pyrite (FeS2) the uptake of uranium onto the surfaces of both weathered and freshly generated pyrite surfaces was examined using batch sorption experiments. Analysis was performed using X-ray photoelectron spectroscopy (XPS). The results clearly indicate that freshly polished pyrite surfaces are efficient scavengers of uranium from solution, while weathered surfaces exhibit only limited uptake. Results also indicate partial reduction of uranium at the pyrite surfaces, with a heterogeneous distribution of U(IV) and U(VI) species.

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