Effect of humic acid on the sorption of Cm(III) onto γ-Al2O3 studied by the time-resolved laser fluorescence spectroscopy
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| 024 | 7 | 0 | |a 10.1524/ract.92.9.691.54982 |2 doi |
| 035 | |a (NATIONALLICENCE)gruyter-10.1524/ract.92.9.691.54982 | ||
| 245 | 0 | 0 | |a Effect of humic acid on the sorption of Cm(III) onto γ-Al2O3 studied by the time-resolved laser fluorescence spectroscopy |h [Elektronische Daten] |c [X. K. Wang, Thomas Rabung, Horst Geckeis, Petra J. Panak, R. Klenze, Thomas Fanghänel] |
| 520 | 3 | |a Sorption of Cm(III) onto γ-alumina coated with humic acid (HA) is studied by the Time Resolved Laser Fluorescence Spectroscopy (TRLFS). The experiments are performed at 0.1M NaClO4, 0.44g/L γ-Al2O3, 10mg/L HA and at a metal ion concentration of 2×10-7mol/L. At the investigated pH range (4 to 10) HA is completely sorbed to γ-Al2O3. The excitation spectrum of Cm(III) bound to HA/γ-Al2O3 in the wavelength range 370-400nm exhibits broad flat bands very different from those obtained for the Cm(III) aquo ion and the Cm(III)-γ-Al2O3 surface complex, respectively. The spectrum, lacking distinctive structure due to intramolecular energy transfer processes, points to the predominant binding of the Cm(III) to surface-bound HA. TRLFS experiments performed at two different excitation wavelengths (λex=355 and 396.6nm) allow for a differentiation of humic-bound and non-humic-bound Cm(III). Differences in fluorescence spectra obtained at the different excitation wavelengths are found at pH<6.9. They are due to the presence of the non-complexed Cm(III) aquo ion which is not detected in the indirect excitation mode (λex=355nm). At pH≥7, the fluorescence spectra obtained by indirect and direct excitation become congruent and again point to the existence of only humic-bound Cm(III) species. Comparison of peak maxima and fluorescence lifetimes for Cm(III)-HA and Cm(III)-HA/γ-Al2O3, however, reveal differences. The results clearly indicate a contribution of the γ-Al2O3 surface to the Cm(III) binding and, thus, suggest the formation of ternary complexes such as >Al-O-Cm(III)(HA). | |
| 540 | |a © 2004 Oldenbourg Wissenschaftsverlag GmbH | ||
| 690 | 7 | |a Laboratory techniques, experiments |2 nationallicence | |
| 690 | 7 | |a Analytical chemistry |2 nationallicence | |
| 690 | 7 | |a Inorganic chemistry |2 nationallicence | |
| 700 | 1 | |a Wang |D X. K. |4 aut | |
| 700 | 1 | |a Rabung |D Thomas |4 aut | |
| 700 | 1 | |a Geckeis |D Horst |4 aut | |
| 700 | 1 | |a Panak |D Petra J. |4 aut | |
| 700 | 1 | |a Klenze |D R. |4 aut | |
| 700 | 1 | |a Fanghänel |D Thomas |4 aut | |
| 773 | 0 | |t Radiochimica Acta/International journal for chemical aspects of nuclear science and technology |d Oldenbourg Wissenschaftsverlag GmbH |g 92/9-11/2004(2004-11-01), 691-695 |x 0033-8230 |q 92:9-11/2004<691 |1 2004 |2 92 |o ract | |
| 856 | 4 | 0 | |u https://doi.org/10.1524/ract.92.9.691.54982 |q text/html |z Onlinezugriff via DOI |
| 908 | |D 1 |a research article |2 jats | ||
| 950 | |B NATIONALLICENCE |P 856 |E 40 |u https://doi.org/10.1524/ract.92.9.691.54982 |q text/html |z Onlinezugriff via DOI | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Wang |D X. K. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Rabung |D Thomas |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Geckeis |D Horst |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Panak |D Petra J. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Klenze |D R. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Fanghänel |D Thomas |4 aut | ||
| 950 | |B NATIONALLICENCE |P 773 |E 0- |t Radiochimica Acta/International journal for chemical aspects of nuclear science and technology |d Oldenbourg Wissenschaftsverlag GmbH |g 92/9-11/2004(2004-11-01), 691-695 |x 0033-8230 |q 92:9-11/2004<691 |1 2004 |2 92 |o ract | ||
| 900 | 7 | |b CC0 |u http://creativecommons.org/publicdomain/zero/1.0 |2 nationallicence | |
| 898 | |a BK010053 |b XK010053 |c XK010000 | ||
| 949 | |B NATIONALLICENCE |F NATIONALLICENCE |b NL-gruyter | ||