Neptunium(V) sorption on quartz and albite in aqueous suspension; Annual progress report

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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 {alpha}-Fe{sub 2}O{sub 3} (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 CO{sub 2} are common in many ground ... continued below

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35 p.

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Kohler, M. & Leckie, J.O. October 1, 1991.

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Description

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 {alpha}-Fe{sub 2}O{sub 3} (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 CO{sub 2} 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 {minus}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 {minus}6} M. In the presence of 50 {mu}M EDTA, Np(V) sorption seems to be restricted. EDTA at the 10{sup {minus}6} M level adsorbs onto albite to an appreciable degree at pH values < 7.5. One {mu}M 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 HCO{sub 3}{sup {minus}} is the predominant solution species.

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35 p.

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INIS; OSTI as DE93040587

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  • Other Information: PBD: Oct 1991

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  • Other: DE93040587
  • Report No.: LA-SUB--93-256
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/139546 | External Link
  • Office of Scientific & Technical Information Report Number: 139546
  • Archival Resource Key: ark:/67531/metadc625070

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  • October 1, 1991

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  • June 16, 2015, 7:43 a.m.

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Kohler, M. & Leckie, J.O. Neptunium(V) sorption on quartz and albite in aqueous suspension; Annual progress report, report, October 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc625070/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.