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Title: Plutonium sorption and desorption behavior on bentonite

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Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Environmental Radioactivity
Additional Journal Information:
Journal Volume: 141; Journal Issue: C; Related Information: CHORUS Timestamp: 2016-09-04 23:15:08; Journal ID: ISSN 0265-931X
Country of Publication:
United Kingdom

Citation Formats

Begg, James D., Zavarin, Mavrik, Tumey, Scott J., and Kersting, Annie B.. Plutonium sorption and desorption behavior on bentonite. United Kingdom: N. p., 2015. Web. doi:10.1016/j.jenvrad.2014.12.002.
Begg, James D., Zavarin, Mavrik, Tumey, Scott J., & Kersting, Annie B.. Plutonium sorption and desorption behavior on bentonite. United Kingdom. doi:10.1016/j.jenvrad.2014.12.002.
Begg, James D., Zavarin, Mavrik, Tumey, Scott J., and Kersting, Annie B.. 2015. "Plutonium sorption and desorption behavior on bentonite". United Kingdom. doi:10.1016/j.jenvrad.2014.12.002.
title = {Plutonium sorption and desorption behavior on bentonite},
author = {Begg, James D. and Zavarin, Mavrik and Tumey, Scott J. and Kersting, Annie B.},
abstractNote = {},
doi = {10.1016/j.jenvrad.2014.12.002},
journal = {Journal of Environmental Radioactivity},
number = C,
volume = 141,
place = {United Kingdom},
year = 2015,
month = 3

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jenvrad.2014.12.002

Citation Metrics:
Cited by: 7works
Citation information provided by
Web of Science

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  • Supercritical fluid extraction (SFE) conditions using pure CO{sub 2} from 40 to 150 C were developed that allow sequential extraction of PCBs associated with rapidly desorbing, moderately, slowly, and very slowly desorbing sites on historically contaminated sediments and soil. Five samples with individual PCB concentrations ranging from a few to {approximately} 100,000 ng/g all showed PCBs associated with each type of site, but the fraction of PCBs associated with rapidly desorbing or slowly desorbing sites varied greatly from sample to sample. Although some small differences in the desorption behavior of individual PCBs was observed from a particular sample, the differencesmore » among samples were much greater demonstrating that the sample matrix and not the PCB identity was most important in controlling desorption behavior. When all five samples were compared, simple considerations concerning sample particle size, water content, organic content, and PCB concentration could not predict desorption behavior, demonstrating that PCB desorption processes depend on multiple sample characteristics. Comparison of the quantity vs. distribution of PCBs on the fast to very slow sites indicates that association with slowly desorbing sites is not limited by the number of sites, but rather that PCBs on historically contaminated samples tend to distribute among the various sites available.« less
  • Supercritical fluid extraction (SFE) with pure CO{sub 2} was used to quantitatively remove PCBs from historically contaminated sediments without substantially disturbing their bulk organic or inorganic matrix as evidenced by only small or undetectable changes in thermal gravimetric behavior, elemental composition, ionic conductivity, and pH determined before and after SFE. The extracted PCBs were then spiked into water with the parent sediment, and sorption was allowed to occur for up to 18 days. The selective SFE conditions developed in part 1 were used to determine the proportion of PCBs which could be extracted under four conditions of increasing stringency. Comparingmore » the selective SFE behavior of the PCBs from the water/sediment sorption samples to the original historically contaminated sediments demonstrated that 18 days was not sufficient for PCBs to migrate to the slower sediment-binding sites, which the PCBs had occupied in the historically contaminated sediments and that the adsorbed PCBs were primarily associated with the binding sites most easily extracted by SFE. Sediment/water distribution coefficients at 18 days were similar for sediments with low contamination levels.« less
  • The rates and extent of plutonium (Pu) sorption and desorption onto mineral surfaces are important parameters for predicting Pu mobility in subsurface environments. The presence of natural organic matter, such as fulvic acid (FA), may influence these parameters. We investigated the effects of FA on Pu(IV) sorption/desorption onto goethite in two scenarios: when FA was (1) initially present in solution or (2) found as organic coatings on the mineral surface. A low pH was used to maximize FA coatings on goethite. Experiments were combined with kinetic modeling and speciation calculations to interpret variations in Pu sorption rates in the presencemore » of FA. Our results indicate that FA can change the rates and extent of Pu sorption onto goethite at pH 4. Differences in the kinetics of Pu sorption were observed as a function of the concentration and initial form of FA. The fraction of desorbed Pu decreased in the presence of FA, indicating that organic matter can stabilize sorbed Pu on goethite. These results suggest that ternary Pu–FA–mineral complexes could enhance colloid-facilitated Pu transport. In conclusion, more representative natural conditions need to be investigated to quantify the relevance of these findings.« less