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Thermodynamic Date for Predicting Concentrations of AnO$$_{2}$$$$^{+}$$ and AnO$$_{2}$$$$^{2+}$$ Species in Geologic Environments

地質環境下におけるアクチニドV価(AnO$$_{2}^{+}$$)およびアクチニドVI価(AnO$$_{2}$$$$^{2+}$$)の濃度予測に関する熱力学データの整備

Choppin, G. R.*; Bronikowski, M.*; Chen, J.*; Byegard, J.*; Rai, D.*; 油井 三和

Choppin, G. R.*; Bronikowski, M.*; Chen, J.*; Byegard, J.*; Rai, D.*; Yui, Mikazu

本研究では、地層処分システム性能評価のための熱力学データベースJNC-TDB(旧PNC-TDB)整備の一環として、V価およびVI価のアクチニド化学種(AnO$$_{2}^{+}$$ and AnO$$_{2}^{2+}$$)に関する熱力学データ整備を行った。本研究では、これらの元素に対して、水酸化物錯体の他、塩化物、フッ化物、炭酸、硝酸、硫酸及びリン酸を含む錯体もしくは化合物に関する熱力学データ整備を行った。Born equationによる安定度定数(log$$beta$$)の推定、Pitzer parameterの検討、酸化還元反応の電位および平衡定数の検討も併せて行った。

This report provides thermodynamic data for predicting concentrations of pentavalent and hexavalent actinide species (AnO$$_{2}^{+}$$ and AnO$$_{2}^{2+}$$) in geologic environments, and contributes to an integration of the JNC chemical thermodynamic database, JNC-TDB (previously PNC-TDB), for the performance analysis of geological isolation system for high-level radioactive wastes. Thermodynamic data for the formation of complexes or compounds with hydroxide, chloride, fluoride, carbonate, nitrate, sulfate and phosphate are discussed in this report. The estimation of the stability constants by use of the Born equation is included. The Pitzer parameters for AnO$$_{2}^{+}$$ and AnO$$_{2}$$$$^{2+}$$, redox potentials and equilibrium constants of redox reactions for actinides are also included.

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