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Examination of the adsorption mechanism of Tl and Cr on selected mineral oxides was carried out by X-ray absorption spectroscopy (XAS) using synchrotron radiation. Information on the oxidation states of surface bound species was obtained from the low energy side of XAS spectra, the XANES (X-ray Absorption Near Edge Structure) region. Surface precipitation of Tl(2)O(3)(s) was found to take place on delta-MnO(2)(s) as a result of Tl(I) sorption and oxidation at the mineral surface. Adsorption of chromates on alpha-FeOOH(s) containing very small amounts of ferrous ions was observed to be followed by partial reduction to Cr(III).

Additional information

Authors: BIDOGLIO G, JRC Ispra (IT);O'GORMAN M, JRC Ispra (IT);GIBSON P N, JRC Ispra (IT);ROBERTS K J, University of Strathclyde, Glasgow (GB)
Bibliographic Reference: Article: Geochimica et Cosmochimica Acta, Vol. 57 (1993) No. 10, pp. 2389-2394
Record Number: 199311144 / Last updated on: 1994-11-29
Original language: en
Available languages: en