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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 UO 2  2+  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  β  111 =10.33 ± 0.26 at ionic strength  I =0.1 M, log  β  111 =10.25 ± 0.25 and log  β  122 =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  β  131 =0.28 ± 0.11, log  β  121 =18.94 ± 0.29 and log  β  111 =15.02 ± 0.23 at  I =0.1 M.

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