Binary and ternary uranium(VI) humate complexes studied by attenuated total reflection Fourier-transform infrared spectroscopy

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Output type: Journal article

Author list: Steudtner R, Muller K, Schmeide K, Sachs S, Bernhard G

Publisher: Royal Society of Chemistry

Publication year: 2011

Journal: Dalton Transactions (1477-9226)

Volume number: 40

Issue number: 44

Start page: 11920

End page: 11925

Number of pages: 6

ISSN: 1477-9226

eISSN: 1477-9234

Languages: English-Great Britain (EN-GB)

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Open access status: closed

Abstract

The complexation of U(VI) with humic acid (HA) in aqueous solution has been investigated at an ionic strength of 0.1 M(NaCl) in the pH range between pH 2 and 10 at different carbonate concentrations by attenuated total reflection Fourier-transform infrared (ATR FT-IR) spectroscopy. For the first time, the formation of binary and ternary U(VI) humate complexes was directly verified by in situ spectroscopic measurements. The complex formation constants for the binary U(VI) humate complex (UO(2)HA(II)) and for the ternary U(VI) mono hydroxo humate complex (UO2(OH)HA(I)) as well as the ternary U(VI) dicarbonato humate complex (UO2(CO3)(2)HA(II)(4-)) determined from the spectroscopic data amount to log beta(0.1 M) = 6.70 +/- 0.25, log beta(0.1 M) = 15.14 +/- 0.25 and log beta(0.1 M) = 24.47 +/- 0.70, respectively, and verify literature data.

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