LLNL SFA FY11 Program Management and Performance Report: Environmental Transport of Plutonium

Kersting, Annie B.; Zavarin, Mavrik; Powell, Brian A.; Moser, David A.; Carroll, Samantha; Maxwell, R. M.; Dai, Z. R.; Williams, Ross W.; Tumey, Scott J.; Zhao, Pihong; Tinnacher, Ruth M.; Huang, Patrick; Kips, R; Mason, Harris E.; Begg, James D.; Fisher, John G.; Simpkins, L; Zimmerman, T; Jablonski, James; Snow, Mathew S.

doi:10.2172/1117837

Cited by 1 publication

(1 citation statement)

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“…The isotherm slope also suggests that polymerization/ surface precipitation processes may be occurring in the two highest Pu concentration samples (initial Pu(IV) -7 and -8 M). This is consistent with Pu-goethite sorption data of Kersting et al (2011) that exhibited substantial Pu precipitation effects only above 10 -8 M Pu. Although the effects of precipitation/polymerization appear to be relatively small when examined across 10 orders of magnitude in Pu concentration and on a log scale, they nonetheless affect the apparent sorption behavior of Pu at the two highest Pu concentration samples (initial Pu(IV) 10 -7 and 10 -8 M).…”

Section: Pu(iv) Sorption To Bentonitesupporting

confidence: 89%

Plutonium sorption and desorption behavior on bentonite

Begg

Zavarin

Tumey

et al. 2015

Journal of Environmental Radioactivity

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Understanding plutonium (Pu) sorption to, and desorption from, mineral phases is key to understanding its subsurface transport. In this work we study Pu(IV) sorption to industrial grade FEBEX bentonite over the concentration range 10(-7)-10(-16) M to determine if sorption at typical environmental concentrations (≤10(-12) M) is the same as sorption at Pu concentrations used in most laboratory experiments (10(-7)-10(-11) M). Pu(IV) sorption was broadly linear over the 10(-7)-10(-16) M concentration range during the 120 d experimental period; however, it took up to 100 d to reach sorption equilibrium. At concentrations ≥10(-8) M, sorption was likely affected by additional Pu(IV) precipitation/polymerization reactions. The extent of sorption was similar to that previously reported for Pu(IV) sorption to SWy-1 Na-montmorillonite over a narrower range of Pu concentrations (10(-11)-10(-7) M). Sorption experiments with FEBEX bentonite and Pu(V) were also performed across a concentration range of 10(-11)-10(-7) M and over a 10 month period which allowed us to estimate the slow apparent rates of Pu(V) reduction on a smectite-rich clay. Finally, a flow cell experiment with Pu(IV) loaded on FEBEX bentonite demonstrated continued desorption of Pu over a 12 day flow period. Comparison with a desorption experiment performed with SWy-1 montmorillonite showed a strong similarity and suggested the importance of montorillonite phases in controlling Pu sorption/desorption reactions on FEBEX bentonite.

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Section: Pu(iv) Sorption To Bentonitesupporting

confidence: 89%