期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 302, 期 1, 页码 240-245出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2006.06.010
关键词
americium; curium; calcite; surface complexation; solid solutions; time-resolved laser fluorescence spectroscopy (TRLFS); extended X-ray absorption fine structure (EXAFS)
Calcite homogeneously doped with Am(III) and Cm(III) was synthesized in a mixed-flow reactor. The mechanism of incorporation of these actinides (An) into calcite was investigated by time-resolved laser fluorescence spectroscopy. Two different An(III)/calcite species were found. One has been identified as ions bonded onto the calcite surface. The second An(III) species has lost its complete hydration sphere and is incorporated into the calcite bulk structure. Both Cm(111)/calcite and Am(III)/calcite complexes have been characterized by their fluorescence emission spectra and lifetimes. Structural parameters of the incorporated Am(III) species determined by EXAFS indicate a coordination number of 6.3 +/- 0.6 and distances of 2.40 +/- 0.01 angstrom for the first Am-O shell. (c) 2006 Elsevier Inc. All rights reserved.
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