caa a22 4500 378927213 CHVBK 20180305123620.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.671.55012 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.671.55012 Distribution and geochemical association of actinides in a contaminated soil as a function of grain size [Elektronische Daten] [M. H. Lee, Y. Y. Yoon, Sue B. Clark, S. E. Glover] The distribution of actinides in a contaminated soil as a function of grain size was investigated by determining 239,240Pu, 241Am, and 238U after size fractionation. The soil was contaminated as the result of a fire at a nuclear missile site in the US. In all cases, the activity of each isotope increased with decreasing particle size, although differences were observed for 238U. A simple spherical model was used to represent surface area as a function of grain size. Fitted values for the distributions of 239,240Pu and 241Am by this model correlated well with experimental values, suggesting that their association is a surface sorption phenomenon. Fitted values for 238U did not correlate with measured values, indicating that U association was not strictly a surface mechanism. To further investigate the partitioning of these isotopes within each size fraction, sequential extractions were performed on the various size fractions. 239,240Pu, 241Am, and 238U are associated with primarily reducible, acid sulfide soluble, and refractory phases, with more total activity associated with the refractory phase for the smaller size fractions. Considering only the final refractory phase for each size fraction, the activity of 238U was greater than 239,240Pu and 241Am. In the context of the behavior of U as a function of grain size, this result suggests that a significant fraction of the U is primordial and incorporated into the refractory matrix, most likely the silicates and refractory clay minerals. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Lee M. H. aut Yoon Y. Y. aut Clark Sue B. aut Glover S. E. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 671-675 0033-8230 92:9-11/2004<671 2004 92 ract https://doi.org/10.1524/ract.92.9.671.55012 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.671.55012 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lee M. H. aut NATIONALLICENCE 700 1- Yoon Y. Y. aut NATIONALLICENCE 700 1- Clark Sue B. aut NATIONALLICENCE 700 1- Glover S. E. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 671-675 0033-8230 92:9-11/2004<671 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter