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Valence separation of Fe and removal of Sn$$^{2+}$$ by solvent extraction as a potential method to determine Fe$$^{2+}$$ in glass containing Sn$$^{2+}$$

菅野 直樹*; 中瀬 正彦*; 西條 佳孝*; 松村 大樹   ; 辻 卓也  ; 竹下 健二*; 塚原 剛彦*

Kanno, Naoki*; Nakase, Masahiko*; Saijo, Yoshitaka*; Matsumura, Daiju; Tsuji, Takuya; Takeshita, Kenji*; Tsukahara, Takehiko*

The amounts of Fe$$^{2+}$$ and Fe$$^{3+}$$ present in glass are important indicators of its optical properties because even small amounts have significant effects. However, it is challenging to use wet chemical analysis to determine the concentration and the ratio of Fe$$^{2+}$$ and Fe$$^{3+}$$ in glass when it contains Sn because of the redox reaction between Sn$$^{2+}$$ and Fe$$^{3+}$$ in the glass decomposition solution. A two-step approach was tested to determine the concentrations of Fe$$^{2+}$$ and Fe$$^{3+}$$ in a glass decomposition solution in the presence of Sn$$^{2+}$$. In the first step, the redox reaction between Sn$$^{2+}$$ and Fe$$^{3+}$$ was suppressed by increased pH. In the second step, Sn$$^{2+}$$ was removed from the glass decomposition solution by solvent extraction. To understand the kinetics of the redox reaction between Sn$$^{2+}$$ and Fe$$^{3+}$$, time-resolved dispersive X-ray absorption fine structure and ultraviolet-visible absorption spectroscopy (UV-vis) were used with standard chloride solutions of Sn and Fe in respective valences. We found that lowering the acid concentration suppressed redox reactions. The partitioning behaviors of Sn$$^{2+}$$, Sn$$^{4+}$$, Fe$$^{2+}$$, and Fe$$^{3+}$$ by bis(2-ethylhexyl) hydrogen phosphate (D2EHPA) as an extractant in ${it n}$-dodecane were investigated to see the removal ability of Sn$$^{2+}$$ from the glass decomposition solution. As a result, D2EHPA in ${it n}$-dodecane could extract Sn$$^{2+}$$, Sn$$^{4+}$$, and Fe$$^{3+}$$ into the organic phase, and Fe$$^{2+}$$ remained in the aqueous phase. The simultaneous removal of Sn$$^{2+}$$ and Sn$$^{4+}$$ and the separation of Fe$$^{2+}$$ and Fe$$^{3+}$$ became possible. This method can potentially apply to the rapid analysis of the concentration of Fe$$^{2+}$$ and Fe$$^{3+}$$ in a glass containing tin oxide.

発表言語

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English

掲載資料名

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Progress in Nuclear Science and Technology (Internet)

巻

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7

号

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ページ数

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p.154 - 160

発行年月

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2025/03

発表会議名

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International Symposium on Zero-Carbon Energy Systems (IZES)

開催年月

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2023/01

開催都市

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Tokyo

開催国

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Japan

キーワード

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SPring-8; XAFS; Dispersive XAFS; Sn K-edge

特許データ

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PDF

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論文URL

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https://doi.org/10.15669/pnst.7.154

研究データの公開先DOI

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本成果にかかわる研究データのリンクです。

使用施設

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SPring-8(大型放射光施設)

広報プレスリリース

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論文解説
(JAEA R&D Navigator)

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受委託・共同研究相手機関

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Access

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- Accesses

InCites™

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Altmetrics

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