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Neptunium(V) sorption on quartz and albite in aqueous suspension; Annual progress report [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
35 pages : digital, PDF file
Additional Creators
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The behavior of neptunium in the subsurface environment is of interest since neptunium isotopes are included in nuclear waste. Previous work investigated the sorption behavior of Np onto α-Fe₂O₃ (hematite), an accessory mineral of the Yucca Mountain repository. The work reported herein involves the much more abundant silicate minerals quartz and albite, and is a logical continuation of the ongoing task. In previous work increased sorption was observed in systems containing hematite and EDTA, a ligand which acts as a surrogate for organic complexing agents. In addition, increased partial pressures of CO₂ are common in many ground waters and the effects of carbonate on sorption of radionuclides have to be studied as well. At concentration levels of 10{sup −7} M, Np(V) does not adsorb strongly on quartz and albite up to pH values of approximately 9 at solid/solution ratios of 30 to 40 g/l. Significant adsorption (> 20%) occurs on both minerals only at pH > 9. Pretreatment of albite affects the sorption behavior of this mineral at pH > 9, possibly due to the formation of secondary mineral phases at the albite surface. EDTA does not adsorb on quartz at concentrations of 10{sup −6} M. In the presence of 50 μM EDTA, Np(V) sorption seems to be restricted. EDTA at the 10{sup −6} M level adsorbs onto albite to an appreciable degree at pH values < 7.5. One μM EDTA has no effect on Np(V) adsorption onto albite. Carbonate species adsorb on quartz and albite, both cases showing a maximum in sorption at pH 6.5 to 7 where HCO₃{sup −} is the predominant solution species.
Report Numbers
E 1.99:la-sub--93-256
la-sub--93-256
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
10/01/1991.
"la-sub--93-256"
"DE93040587"
Leckie, J.O.; Kohler, M.
Funding Information
W-7405-ENG-36
View MARC record | catkey: 14145478