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Diffusion of Neptuiyl(V)- and Pertechnetate Ions in Marine Sediments*

Published online by Cambridge University Press:  15 February 2011

F. Schreiner
Affiliation:
Chemistry Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
S. Fried
Affiliation:
Chemistry Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
A. Friedman
Affiliation:
Chemistry Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
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Abstract

The diffusion of the 235NpO2+ and 95m TCo4 -ions has been measured directly in sample cylinders of two different sediments from the floor of the deep sea. In smectiterich sediment not shielded from contact with atmospheric oxygen the following values were obtained for the effective diffusion coefficients of neptunyl- and pertechnetateions, respectively: Deff(NpO2+) = 1.5 × 10−12 m2 s−1 and Deff(TcO4) = 3.2 × 10−10 m2 s−1. Under anoxic conditions in sediment with known reducing properties, the pertechnetate ion appears to undergo slow reduction and the effective diffusion coefficient of the reduced species of Deff(Tc,red)= 1.1 × 1014 m2 s−1 reflects a substantial decrease of the mobility of the lower-valent technetium.

Type
Research Article
Copyright
Copyright © Materials Research Society 1982

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Footnotes

*

Based on work performed under the auspices of the Sandia National Laboratory Program Contract Number 74-1160.

References

REFERENCES

1. Fried, S., Friedman, A. and Schreiner, F., A Study of the Mobility of Plutonium and Americium in Clay, Annual Report, September 1980, Sandia National Laboratory Report No. SAND 81–7114Google Scholar