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A. Günther, Gerhard Geipel, Gert Bernhard

Complex formation of U(VI) with the amino acid L-threonine and the corresponding phosphate ester O-phospho-L-threonine

Keywords: Uranium, Complexation, Amino acid, TRLFS

The complex formation of uranium(VI) with L-threonine and O-phospho-L-threonine was studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS). An increase in fluorescence emission intensity and a corresponding red shift of the bands in the spectra compared to the free uranyl cation indicate a complex formation between UO₂²⁺ and the non- and phosphorylated amino acid L-threonine. The complex formation constants for a 1:1 and 1:2 complex in the case of L-threonine were determined to be log β₁₁₁=10.33±0.26 at ionic strength I=0.1 M, log β₁₁₁=10.25±0.25 and log β₁₂₂=19.94±0.24 at ionic strength I=0.5 M. The calculated constants of the different 1:1 uranyl complexes with O-phospho-L-threonine are log β₁₃₁=0.28±0.11, log β₁₂₁=18.94±0.29 and log β₁₁₁=15.02±0.23 at I=0.1 M.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 94, 12/2006
Pages: 845 - 851

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