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Report No.

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 ; Nagame, Yuichiro; Sch$"a$del, M.; Kasamatsu, Yoshitaka*; Kogama, Yuka*; Shinohara, Atsushi*; Haba, Hiromitsu*; Even, J.*

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.



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