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Electron transfer during selenium reduction by iron surfaces in aqueous solution: High resolution X-ray absorption study

K O Kvashnina, S M Butorin2, D Cui3, J Vegelius2, A Puranen4, R Gens5 and P Glatzel1

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We present a study of selenate (SeO42-) on an iron surface in ground water solution by X-ray absorption near-edge spectroscopy. Spectral sharpening is obtained by using the high energy resolution fluorescence detection technique that also efficiently suppresses the strong fluorescence signal from the Fe surface in the highly dilute samples (Se concentration < 3 ppm). We observe fully reduced Se on polished Fe surfaces while no changes are found for Se on oxidized Fe surface.


PACS

78.70.Dm X-ray absorption spectra

81.65.Mq Oxidation

82.30.-b Specific chemical reactions; reaction mechanisms

78.55.Hx Other solid inorganic materials

81.65.Ps Polishing, grinding, surface finishing

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Chemical physics and physical chemistry

Dates

Issue 1 (2009)



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