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The Determination of the Solubility of Amorphous UO2 (Sn and the Mononuclear Hydrolysis Constants of Uranium(IV) at 25° C.

Published online by Cambridge University Press:  28 February 2011

Jordi Bruno ,
Ignasi Casas ,
Bo Lagerman  and
Maria Munoz
Jordi Bruno
Affiliation:
Deparment of Inorganic Chemistry, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
Ignasi Casas
Affiliation:
Deparment of Inorganic Chemistry, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
Bo Lagerman
Affiliation:
Deparment of Inorganic Chemistry, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
Maria Munoz
Affiliation:
Deparment of Inorganic Chemistry, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Abstract

We have measured the solubility 8f amorphous UO2in a wide pH range (2 to 10.5), in 0.5 M NaClO, at T=25 C. The species responsible for the solubility are U(OH) + and U'0H)h, with the stability constants lo:1,3=-1.1± 0.1 and log, 4 =- 5.4_.O. 2, respectively. No evidence for U(OH) is f6und up to pH=10.5. The same model explains satisfactorily the solubility data obtained by Parks and Pohl(5) at T=1000 C., in the pH range 1 to 10. The measured solubility of amorphous UO2 (s) in the pH_ýange 6 to 10.5, under reducing conditions, is rather high,. U(IV) =5 10 mols/l. This is in good agreement with previous data of Gayer and Leider(6) and Galkin and Stepanov(9).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 153
Copyright
Copyright © Materials Research Society 1987

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