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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/7399

Title: Solution speciation of plutonium and Americium at an Australian legacy radioactive waste disposal site
Authors: Ikeda-Ohno, A
Harrison, J
Thiruvoth, S
Wilsher, K
Wong, HKY
Johansen, MP
Waite, TD
Payne, TE
Keywords: Radioactive wastes
Plutonium
Americium
Soils
Fluorides
Colloids
Issue Date: 15-Aug-2014
Publisher: ACS Publications
Citation: Ikeda-Ohno, A., Harrison, J. J., Thiruvoth, S., Wilsher, K., Wong, H. K. Y., Johansen, M. P., . . . Payne, T. E. (2014). Solution Speciation of Plutonium and Americium at an Australian Legacy Radioactive Waste Disposal Site. Environmental Science & Technology, 48(17), 10045-10053. doi: http://dx.doi.org/10.1021/es500539t
Abstract: During the 1960s, radioactive waste containing small amounts of plutonium (Pu) and americium (Am) was disposed in shallow trenches at the Little Forest Burial Ground (LFBG), located near the southern suburbs of Sydney, Australia. Because of periodic saturation and overflowing of the former disposal trenches, Pu and Am have been transferred from the buried wastes into the surrounding surface soils. The presence of readily detected amounts of Pu and Am in the trench waters provides a unique opportunity to study their aqueous speciation under environmentally relevant conditions. This study aims to comprehensively investigate the chemical speciation of Pu and Am in the trench water by combining fluoride coprecipitation, solvent extraction, particle size fractionation, and thermochemical modeling. The predominant oxidation states of dissolved Pu and Am species were found to be Pu(IV) and Am(III), and large proportions of both actinides (Pu, 97.7%; Am, 86.8%) were associated with mobile colloids in the submicron size range. On the basis of this information, possible management options are assessed. © 2014, American Chemical Society.
URI: http://dx.doi.org/10.1021/es500539t
http://apo.ansto.gov.au/dspace/handle/10238/7399
ISSN: 1520-5851
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