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論文

Evaluation of thermodynamic model of Pd(II) complex formation with isosaccharinic acid

紀室 辰伍; 種市 やよい; 岩田 孟; 石寺 孝充; 北村 暁; 舘 幸男; 田中 武流*; 平野 佳奈*; 檜枝 愛美*; 宮部 俊輔*; et al.

Journal of Solution Chemistry, 53(6), p.854 - 868, 2024/06

https://doi.org/10.1007/s10953-023-01352-6
 被引用回数：0 パーセンタイル：0.00(Chemistry, Physical)

Palladium is one of the selected radionuclides in the safety assessment of the disposal of radioactive waste. Although isosaccharinic acid (ISA) forms strong complexes with many elements and enhances element solubility, the thermodynamic evaluation of the complex of Pd with ISA has not been conducted. In this study, the solubility of Pd(OH)$$_{2}$$ at pH 8.5 - 12.5 in the presence of ISA was investigated under inert gas (N$$_{2}$$) atmosphere. Furthermore, the coordination state of aqueous Pd and ISA was investigated by X-ray absorption and Fourie transform infrared spectroscopy, respectively. According to experimental results, the chemical form of the Pd-ISA complex depends on the solution pH; specifically, the number of involved OH$$^{-}$$ ions in the complex should be changed. The thermodynamic model and conditional equilibrium constants of the Pd-ISA complex were estimated by slope analyses of solubility experiments at different pH levels and ionic strengths based on the specific ion interaction theory. Hence, the impact of complexation with ISA on Pd(II) solubility under disposal conditions could be quantified using the proposed thermodynamic models in this study.

論文

A Thermodynamic model for ZrO$$_{2}$$(am) solubility at 25$$^{circ}$$C in the Ca$$^{2+}$$-Na$$^{+}$$-H$$^{+}$$-Cl$$^{-}$$-OH$$^{-}$$-H$$_{2}$$O system; A Critical review

Rai, D.*; 北村 暁; Altmaier, M.*; Rosso, K. M.*; 佐々木 隆之*; 小林 大志*

Journal of Solution Chemistry, 47(5), p.855 - 891, 2018/05

https://doi.org/10.1007/s10953-018-0766-4
 被引用回数：11 パーセンタイル：10.90(Chemistry, Physical)

ジルコニウムについて、単核および複核の加水分解種の生成定数および非晶質二酸化ジルコニウム(ZrO$$_{2}$$(am))の溶解度積を導出した実験データをレビューした。このレビューを通して、加水分解種(Zr(OH)$$_{2}$$$$^{2+}$$, Zr(OH)$$_{4}$$(aq), Zr(OH)$$_{5}$$$$^{-}$$, Zr(OH)$$_{6}$$$$^{2-}$$およびCa$$_{3}$$Zr(OH)$$_{6}$$$$^{4+}$$)の生成定数やZrO$$_{2}$$(am)の溶解度積を新規に決定もしくは改訂した。

論文

Luminescence and potentiometric studies on the complexation of europium(III) by picolinate in an aqueous solution

青柳 登; 虎石 貴*; 長崎 晋也*; 田中 知*

Journal of Applied Solution Chemistry and Modeling, 1(2), p.148 - 155, 2012/12

https://doi.org/10.6000/1929-5030.2012.01.02.11

The complexation behavior of Eu$$^{3+}$$ aquo ions by picolinic acid in aqueous solutions is investigated so as to describe the formation of poly nuclear complexes which are uncommon for trivalent lanthanides. Potentiometric titration exhibited that no poly-nuclear complexes form via hydroxide bridges even at high pH, providing a monomeric form, [Eu(Pic)$$_{4}$$$$cdot$$(H$$_{2}$$O)]$$^{-}$$, with picolinate ligand in a large excess. In addition, the lifetime analysis of Eu$$^{3+}$$ luminescence in time-resolved laser-induced fluorescence spectroscopy was performed under the condition where Eu(pic)$$^{2+}$$ appears as the secondary dominant species. The result showed the strong quenching of luminescence, suggesting the polymeric complexes, [Eu(Pic)]$$_{m}$$$$^{2m+}$$, form even at low pH due to the vicinal Eu-Eu interaction.

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