The adsorption of plutonium IV and V on goethite

Sanchez, Anthony; Murray, James; Sibley, Thomas H.

doi:10.1016/0016-7037(85)90230-3

Cited by 242 publications

(237 citation statements)

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“…These are much higher than those observed for Np(V) in the same waters as described previously. High surface redox reactivity for plutonium and possible disproportionation of Pu(V) to Pu(VI) and Pu(IV) were observed in sorption studies using goethite by Keeney-Kennicutt and Morse (1985) and Sanchez et al (1985). Desorption by plutonium was typically less from hematite than from aluminosilicates in studies with J-13 water described by Runde et al (2002a).…”

Section: Plutoniummentioning

confidence: 99%

“…Langmuir (1997b) compiles surface complexation constants for actinides and fission products based on several different SCMs. Other compilations are based on the TLM; these include those of Hsi and Langmuir (1985), Tripathi (1983), McKinley et al (1995), , and Lenhart and Honeyman (1999) for uranium; Girvin et al (1991) and Kohler et al (1999) for neptunium; LaFlamme and Murray (1987), Quigley et al (1996), and Murphy et al (1999) for thorium and Sanchez et al (1985) for plutonium. Langmuir (1997b), , Wang et al (2001a, b), and Turner et al (2002) provide references to a large number of other surface complexation studies of radionuclides.…”

Section: Constantsmentioning

confidence: 99%

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Environmental Geochemistry of Radioactive Contamination

Siegel

Bryan

2003

Treatise on Geochemistry

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This report attempts to describe the geochemical foundations of the behavior of radionuclides in the environment. The information is obtained and applied in three interacting spheres of inquiry and analysis: 1) experimental studies and theoretical calculations, 2) field studies of contaminated and natural analog sites and 3) model predictions of radionuclide behavior in remediation and waste disposal. Analyses of the risks from radioactive contamination require estimation of the rates of release and dispersion of the radionuclides through potential exposure pathways. These processes are controlled by solubility, speciation, sorption, and colloidal transport, which are strong functions of the compositions of the groundwater and geomedia as well as the atomic structure of the radionuclides.The chemistry of the fission products is relatively simple compared to the actinides. Because of their relatively short half-lives, fission products account for a large fraction of the radioactivity in nuclear waste for the first several hundred years but do not represent a long-term hazard in the environment. The chemistry of the longer-lived actinides is complex; however, some trends in their behavior can be described. Actinide elements of a given oxidation state have either similar or systematically varying chemical properties due to similarities in ionic size, coordination number, valence, and electron structure. In dilute aqueous systems at neutral to basic pH, the dominant actinide species are hydroxy-and carbonato-complexes, and the solubility-limiting solid phases are commonly oxides, hydroxides or carbonates. In general, actinide sorption will decrease in the presence of ligands that complex with the radionuclide; sorption of the (IV) species of actinides (Np, Pu, U) is generally greater than of the (V) species.The geochemistry of key radionuclides in three different environments is described in this report. These include: 1) low ionic strength reducing waters from crystalline rocks at nuclear waste research 4 sites in Sweden; 2) oxic water from the J-13 well at Yucca Mountain, Nevada, the site of a proposed repository for high level nuclear waste (HLW) in tuffaceous rocks; and 3) reference brines associated with the Waste Isolation Pilot Plant (WIPP). The transport behaviors of radionuclides associated with the Chernobyl reactor accident and the Oklo Natural Reactor are described. These examples span wide temporal and spatial scales and include the rapid geochemical and physical processes important to nuclear reactor accidents or industrial discharges as well as the slower processes important to the geologic disposal of nuclear waste.Application of geochemical information to remediating or assessing the risk posed by radioactive contamination is the final subject of this report. After radioactive source terms have been removed, large volumes of soil and water with low but potentially hazardous levels of contamination may remain. For poorly-sorbing radionuclides, capture of contaminated water and removal of radi...

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Section: Plutoniummentioning

confidence: 99%

Section: Constantsmentioning

confidence: 99%

Environmental Geochemistry of Radioactive Contamination

Siegel

Bryan

2003

Treatise on Geochemistry

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“…The resulting sorption edge is shown in Figure 6.6-13 (Sanchez et al 1985 [DIRS 107213], Figure 3). It should be noted however, that these data are for a carbonate-free system.…”

Section: Sorption Dependence On Solution Compositionmentioning

confidence: 99%

EBS Radionuclide Transport Abstraction

Schreiber¹

2005

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“…Sorption has been shown to be an important mechanism in the Plutonium sorption on goethite and hematite from basic solutions Sorption/precipitation of Pu(1V) from solutions containing high This is likely due Sanchez et al (1985) measured sorption of Pu(1V) and…”

Section: Plutonium/absorber Ratiosmentioning

confidence: 99%

Criticality safety assessment of tank 241-C-106 remediation

Waltar¹

1996

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The s u b j e c t document contains t h e a n a l y s i s t o support t h e p o s i t i o n paper and t h e c r i t i c a l i t y review team r e p o r t on c r i t i c a l i t y s a f e t y issues associated w i t h the r e t r i e v a l CRITICALITY SAFETY ASSESSMENT OF TANK 241-C-106 REMEDIATIONE x p e r t C r i t i c a l i t y T e a m A u t h o r s : i WHC-SD-W320-CSA-001 REV 0 ACKNOWLEDGEMENTS The authors o f t h e r e p o r t would l i k e t o acknowledge t h e c o n t r i b u t i o n and a s s i s t a n c e p r o v i d e d by D r . Rowland F e l t from t h e U.S. Department o f Energy (EH-34).I n a d d i t i o n t o being a r e p o r t author, Dr. F e l t a l s o arranged a DOE independent r e v i e w o f t h e s a f e t y a n a l y s i s document t o ensure peer r e v i e w and t e c h n i c a l c r e d i b i l i t y . The independent r e v i e w team members are a l s o acknowledged f o r t h e i r t i m e and e f f o r t t o r e v i e w t h e document. Independent The team notes that in order for a neutronic criticality to be possible, the plutonium concentration in an infinite volume of waste must exceed 2.6 g Pu/L. Numerous layers of conservatism are built into this minimum fissile concentration, including optimal neutron moderation (i.e., optimal water moisture content), a waste medium containing a small fraction of the neutron absorbers actually present, and an infinite geometry. Since the maximum concentration of plutonium measured in either donor tank 241-C-106 or receiver tank 241-AY-102 was 0.13 g Pu/L, a plutonium concentration increase of at least 20 would be necessary to achieve criticality under the most ideal possibility of achieving such a scenario is highly unlikely.geometries would be considerably less reactive. The physical More realisticThe important message is that all of the "gates" illustrated in

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The adsorption of plutonium IV and V on goethite

Cited by 242 publications

References 15 publications

Environmental Geochemistry of Radioactive Contamination

Environmental Geochemistry of Radioactive Contamination

EBS Radionuclide Transport Abstraction

Criticality safety assessment of tank 241-C-106 remediation

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