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Oral presentation

Electrochemical reduction of mendelevium in HCl solution

Toyoshima, Atsushi; Oe, Kazuhiro; Li, Z.*; Asai, Masato; Sato, Nozomi; Sato, Tetsuya; Kikuchi, Takahiro; Kaneya, Yusuke*; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; et al.

no journal, , 

Electrochemical study of mendelevium (Md) with flow electrolytic column chromatography is presented. The $$^{255}$$Md isotope was produced in the $$^{248}$$Cm($$^{11}$$B, 4$${it n}$$) reaction at the JAEA tandem accelerator. In applying a negative voltage on the column electrode, Md was eluted with 0.1 M HCl. This behavior is quite similar to that of Sr$$^{2+}$$ and Eu$$^{2+}$$, clearly indicating that most stable Md$$^{3+}$$ is reduced to Md$$^{2}+$$. We determined the redox potential of Md to be approximately -0.18 V versus a standard hydrogen electrode.

Oral presentation

Determination of redox potential of mendelevium (Md)

Toyoshima, Atsushi; Li, Z.*; Asai, Masato; Sato, Nozomi; Sato, Tetsuya; Oe, Kazuhiro; Kikuchi, Takahiro; Kaneya, Yusuke*; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; et al.

no journal, , 

Redox potential of mendelevium (Md) was determined with flow electrolytic chromatography. Mendelevium-255 with a half-life of 27 min was produced in the $$^{248}$$Cm($$^{11}$$B, 4$${it n}$$) reaction at the JAEA tandem accelerator. Reaction products transported by a KCl/He gas-jet method were collected on a chemistry apparatus. After removing KCl with HDEHP column chromatography, elution behavior of Md in 0.10 M HCl was investigated with a flow electrolytic column apparatus at the applied potentials between -0.3 and -0.6 V vs. a Ag/AgCl reference electrode. At -0.3 V, elution behavior of Md was the same as that of $$^{250}$$Bk$$^{3+}$$, showing that the stable Md$$^{3+}$$ was not reduced to the divalent state. At -0.6 V, elution of Md was quite similar to that of Sr$$^{2+}$$, demonstrating that Md$$^{3+}$$ was successfully reduced to Md$$^{2+}$$. From the behavior of Md against the applied potentials, we evaluated its redox potential to be -0.40$$pm$$0.03 V.

Oral presentation

Electrolytic reduction of mendelevium using a flow electrolytic column

Toyoshima, Atsushi; Li, Z.*; Asai, Masato; Sato, Tetsuya; Kikuchi, Takahiro*; Kaneya, Yusuke*; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; Nagame, Yuichiro; Sch$"a$del, M.; et al.

no journal, , 

The redox behavior of mendelevium (Md) was studied with flow electrolytic chromatography. The $$^{255}$$Md isotope produced in the $$^{248}$$Cm($$^{11}$$B, 4n)$$^{255}$$Md reaction at the JAEA tandem accelerator was used in the electrolytic reduction experiment with the flow electrolytic column apparatus in 0.1 M HCl. It was clearly observed that, applying appropriate potentials on the chromatography column, the most stable Md$$^{3+}$$ is reduced to Md$$^{2+}$$. The redox potential of the Md$$^{2+}$$ = Md$$^{3+}$$ + e$$^{-}$$ couple was determined to be -0.16 $$pm$$ 0.05 V vs. a normal hydrogen electrode.

Oral presentation

The Redox potential of mendelevium (Md) determined atom-at-a-time with a flow electrolytic column

Sch$"a$del, M.; Toyoshima, Atsushi; Li, Z.*; Asai, Masato; Sato, Nozomi; Kikuchi, Takahiro; Kaneya, Yusuke; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; Nagame, Yuichiro; et al.

no journal, , 

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