X-ray absorption spectroscopy investigation of surface redox transformations of thallium and chromium on colloidal mineral oxidesFunded under: JRC-ENVPROT 6C
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).
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