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Iodine Release from Silver Iodide under Reducing Condition with Iron-Bearing Minerals

Published online by Cambridge University Press:  21 March 2011

X. Xia ,
Y. Inagaki ,
A. Hattori ,
K. Idemitsu  and
T. Arima
X. Xia
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka, 812-8581, Japan
Y. Inagaki
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka, 812-8581, Japan
A. Hattori
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka, 812-8581, Japan
K. Idemitsu
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka, 812-8581, Japan
T. Arima
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka, 812-8581, Japan
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Abstract

Iodine release from silver iodide (AgI) to water was evaluated under reducing conditions in the presence of iron-bearing minerals, goethite (FeOOH), magnetite (Fe3O4) and Wüstite (FeO). The release tests were performed in a glove box purged with gas mixture (Ar+5%H2), and the concentrations of dissolved iodine, silver and iron were measured. The apparent equilibrium concentration of dissolved iodine was 4.0 ×10−8, 4.3×10−8 mol/l for the tests with FeOOH and Fe3O4, respectively. The values were almost the same as in the test without minerals. For the test with FeO, the concentration of dissolved iodine was 5.4×10−3 mol/l, which is five orders of magnitude higher than for the other tests. Solid phase analyses by using XRD and SEM/EDS indicated that metallic silver precipitated on the surface of the original AgI for the test with FeO and on the surface of Fe3O4 for the test with Fe3O4, but not for that with FeOOH. These results showed that only FeO could reduce AgI effectively to increase iodine release. The amount of dissolved Fe(II) was a key factor affecting AgI reduction instead of redox potential of solution. Kinetic processes may also play an important role in AgI reduction and associated iodine release under reducing condition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ10.6
Copyright
Copyright © Materials Research Society 2002

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References

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