Influence of humic-acid complexing on the mobility of Americium in the soil aquatic environment

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Diffusion data indicate the Am, Cm and Np migrate 1.2, 0.8, and 26 centimeters, respectively, in a thousand years. Thus, excluding mass transport by moving water or wind, actinide elements, such as Cm, Am, and Np that find their way to the soil-aquatic environment are relatively immobile. Measured diffusion coefficients, corrected for distribution between the aqueous and soil phases, tortuosity, negative absorption, and relative fluidity are in reasonable agreement with aqueous diffusion coefficients. However, agreement depends strongly on measurement method used to determine distribution ratios. Two sets of experiments with /sup 241/Am and /sup 152/Eu tracers have been done to ... continued below

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Pages: 13

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Sheppard, J.C.; Campbell, M.J. & Kittrick, J.A. March 1, 1982.

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Description

Diffusion data indicate the Am, Cm and Np migrate 1.2, 0.8, and 26 centimeters, respectively, in a thousand years. Thus, excluding mass transport by moving water or wind, actinide elements, such as Cm, Am, and Np that find their way to the soil-aquatic environment are relatively immobile. Measured diffusion coefficients, corrected for distribution between the aqueous and soil phases, tortuosity, negative absorption, and relative fluidity are in reasonable agreement with aqueous diffusion coefficients. However, agreement depends strongly on measurement method used to determine distribution ratios. Two sets of experiments with /sup 241/Am and /sup 152/Eu tracers have been done to measure distribution ratios as a function of the aqueous humic acid concentration. In the first experiments the solid phase was kaolinite and in the second series of distribution ratios were measured with Burbank sandy loam. Both of these experiments indicated that Am(III) and Eu(III) form very strong humic acid complexes with formation constants of approximately 10/sup 5/. Additional experiments are being done to establish the average number of Am(III)s or Eu(III)s bound to the humic acid polymer.

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Pages: 13

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NTIS, PC A02/MF A01.

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  • Other: DE82013666
  • Report No.: DOE/EV/73012-2
  • Grant Number: AT06-76EV73012
  • DOI: 10.2172/5292679 | External Link
  • Office of Scientific & Technical Information Report Number: 5292679
  • Archival Resource Key: ark:/67531/metadc1068039

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 1, 1982

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • April 4, 2018, 12:42 p.m.

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Sheppard, J.C.; Campbell, M.J. & Kittrick, J.A. Influence of humic-acid complexing on the mobility of Americium in the soil aquatic environment, report, March 1, 1982; United States. (digital.library.unt.edu/ark:/67531/metadc1068039/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.