Neptunium(V) and neptunium(VI) solubilities in synthetic brines of interest to the Waste Isolation Pilot Plant (WIPP)

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Description

The solubility of Np(V) and Np(VI) has been measured in three synthetic Na-K-Mg-Cl brines in the presence of CO{sub 2}(g). Experiments were prepared from oversaturation by adding an excess of NpO{sub 2}{sup +} or NpO{sub 2}{sup 2+} to the brines and allowing the neptunium solids to precipitate. Vessels were maintained in contact with fixed CO{sub 2}(g) partial pressures at constant pH and 24 {+-} 1 C. Dissolved Np(V) concentrations decreased several orders of magnitude within the first 100 days of the experiment, while dissolved Np(VI) concentrations decreased initially but then remained relatively constant for more than 400 days. The solid ... continued below

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17 p.

Creation Information

Novak, C.F.; Nitsche, H. & Silber, H.B. December 31, 1996.

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  • Novak, C.F. Sandia National Labs., Albuquerque, NM (United States)
  • Nitsche, H. Forschungszentrum Rossendorf e.V., Dresden (Germany). Inst. fuer Radiochemie
  • Silber, H.B. Lawrence Berkeley National Lab., CA (United States). Earth Sciences Div.

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Description

The solubility of Np(V) and Np(VI) has been measured in three synthetic Na-K-Mg-Cl brines in the presence of CO{sub 2}(g). Experiments were prepared from oversaturation by adding an excess of NpO{sub 2}{sup +} or NpO{sub 2}{sup 2+} to the brines and allowing the neptunium solids to precipitate. Vessels were maintained in contact with fixed CO{sub 2}(g) partial pressures at constant pH and 24 {+-} 1 C. Dissolved Np(V) concentrations decreased several orders of magnitude within the first 100 days of the experiment, while dissolved Np(VI) concentrations decreased initially but then remained relatively constant for more than 400 days. The solid phases formed in all experiments were identified by X-ray powder diffraction as KNpO{sub 2}CO{sub 3}{center_dot}xH{sub 2}O(s). Steady state concentrations for Np(V) are similar to those observed for Pu(V) in the same brines under the same conditions, where Pu occurs predominantly as Pu(V). Similarly, steady state concentrations for Np(VI), which was not reduced over a two year period, compare well with measured Pu(VI) concentrations in the same brines before the Pu(VI) was reduced to Pu(V).

Physical Description

17 p.

Notes

INIS; OSTI as DE97004037

Source

  • Symposium on micromechanics of plasticity and damage of multiphase materials, Palaiseau (France), 4-8 Sep 1995

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  • Other: DE97004037
  • Report No.: SAND--96-2472C
  • Report No.: CONF-950903--1
  • Grant Number: AC04-94AL85000;AC03-76SF00098
  • DOI: 10.2172/463592 | External Link
  • Office of Scientific & Technical Information Report Number: 463592
  • Archival Resource Key: ark:/67531/metadc679594

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  • December 31, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

Description Last Updated

  • June 27, 2016, 3:24 p.m.

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Novak, C.F.; Nitsche, H. & Silber, H.B. Neptunium(V) and neptunium(VI) solubilities in synthetic brines of interest to the Waste Isolation Pilot Plant (WIPP), report, December 31, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc679594/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.