caa a22 4500 378847236 CHVBK 20180305123314.0 cr unu---uuuuu 161128e20030601xx s 000 0 eng 10.1524/ract.91.6.329.20028 doi (NATIONALLICENCE)gruyter-10.1524/ract.91.6.329.20028 A fluorescence spectroscopic study on the speciation of Cm(III) and Eu(III) in the presence of organic chelates in highly basic solutions [Elektronische Daten] [Zheming Wang, Andrew R. Felmy, Yuanxian Xia, M. J. Mason] The speciation of Eu(III) and Cm(III) was investigated by time resolved laser fluorescence spectroscopy (TRLFS) over a range of base concentrations from 0.01M NaOH to 7.5M NaOH and in the presence of several organic chelates including EDTA, HEDTA, NTA, and oxalate. The results of this work suggest that both Eu(III) and Cm(III) form strong mixed ligand complexes with organic chelates and the hydroxyl groups(s) in dilute NaOH solutions. However, in concentrated NaOH solutions, Eu(III)-/Cm(III)-containing colloidal nanoparticles are the primary cause for the measured Eu(III)/Cm(III) in the aqueous solutions. Therefore, the interpretation of these data solely in terms of the formation of amphoteric hydroxyl species ( e.g. Eu(OH)4-) would appear to be inappropriate. The organic chelating ligands form strong complexes with surface Cm(III)/Eu(III) sites of the colloidal nanoparticles. For Cm(III), such surface complexes show largely red-shifted fluorescence spectra as compared with the aqueous complexes and unusually short fluorescence lifetimes. The decreased fluorescence lifetimes are likely due to the presence of transition metal impurities in the nanoparticle and reduced inter-nuclear distance between neighboring Cm(III) centers. © 2003 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Wang Zheming aut Felmy Andrew R. aut Xia Yuanxian aut Mason M. J. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/6/2003(2003-06-01), 329-338 0033-8230 91:6/2003<329 2003 91 ract https://doi.org/10.1524/ract.91.6.329.20028 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.91.6.329.20028 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Zheming aut NATIONALLICENCE 700 1- Felmy Andrew R. aut NATIONALLICENCE 700 1- Xia Yuanxian aut NATIONALLICENCE 700 1- Mason M. J. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 91/6/2003(2003-06-01), 329-338 0033-8230 91:6/2003<329 2003 91 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter