Electrochemistry of the heaveist elements

Toyoshima, Atsushi; Tsukada, Kazuaki  ; Asai, Masato  ; Kitatsuji, Yoshihiro  ; Ishii, Yasuo; Sato, Tetsuya   ; Li, Z.; Sato, Nozomi; Kikuchi, Takahiro; Nishinaka, Ichiro; Nagame, Yuichiro ; Kasamatsu, Yoshitaka*; Haba, Hiromitsu*; Oe, Kazuhiro*; Shinohara, Atsushi*; Sato, Wataru*; Akiyama, Kazuhiko*; Even, J.*

Electrochemical studies of nobelium (No) and mendelevium (Md) using an electrolytic column chromatography at JAEA will be presented. The isotopes No and Md were produced in the Cm(C, 5n) and Cm(B, 4n) reactions, respectively, at the JAEA tandem accelerator. In the experiment of No, the oxidation of No to No in 0.1 M -hydroxyisobutyric acid (-HIB) was studied with comparing with the elution of Sr and Yb. At the applied potential of 0.2 V, No was not eluted with -HIB. This adsorption of No was the same as that of Sr, indicating that No was bound in its stable divalent state. On the other hand, the elution of No in -HIB was observed at 1.2 V at the position of Yb, which demonstrated that No was successfully oxidized to No. Reduction of Md to Md was also successfully carried out with the apparatus in 0.1 M HCl.