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Formation and Properties of Americium Colloids in Aqueous Systems

Published online by Cambridge University Press:  15 February 2011

U. Olofsson ,
B. Allard ,
K. Andersson  and
B. Torstenfelt
U. Olofsson
Affiliation:
Department of Nuclear Chemistry, Chalmers University of Technology, S–412 96 Göteborg, Sweden.
B. Allard
Affiliation:
Department of Nuclear Chemistry, Chalmers University of Technology, S–412 96 Göteborg, Sweden.
K. Andersson
Affiliation:
Department of Nuclear Chemistry, Chalmers University of Technology, S–412 96 Göteborg, Sweden.
B. Torstenfelt
Affiliation:
Department of Nuclear Chemistry, Chalmers University of Technology, S–412 96 Göteborg, Sweden.
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Abstract

The formation and sorption properties of colloidal americium in aqueous solutions have been studied with variations of pH (2–12), ionic strength (0.01–1.0 M NaClO4), americium concentration (10−7 −10−11 M) and storage time (6 h–6 months). A large fraction of the americium is sorbed on the container walls or on Al2O3 in the pH-range 7–11. Around pH 5–8 and at pH above 12 centrifugable fractions (particle sizes greater than 100 nm) are obtained. The fraction formed at pH above 12, which seems to be a true hydroxide colloid, migrates through an A12O3-filled column with very little retention. The average charge of americium species in solution changes from positive values at pH below 7–8 to negative values at pH above 10–11, as indicated from electromigration studies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 6: Symposium D – Scientific Basis for Nuclear Waste Management IV , 1981 , 191
Copyright
Copyright © Materials Research Society 1982

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References

REFERENCES

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