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$$alpha$$-HiB complexation and ion-exchange behavior of the group-4 elements as homologues of Rf

Kikuchi, Takahiro; Toyoshima, Atsushi; Li, Z.; Tsukada, Kazuaki  ; Asai, Masato  ; Sato, Tetsuya   ; Sato, Nozomi; Nagame, Yuichiro ; Kasamatsu, Yoshitaka*; Fan, F.*

We studied complexation of the group-4 elements Zr and Hf as well as the pseudo group-4 element Th with $$alpha$$-hydroxyisobutyric acid ($$alpha$$-HiB) as homologues of Element 104, rutherfordium (Rf). The isotopes of $$^{88}$$Zr and $$^{175}$$Hf were produced at the JAEA tandem accelerator while $$^{234}$$Th was separated from $$^{238}$$U. These radiotracers stocked in $$alpha$$-HiB/HNO$$_{3}$$ were mixed with cation-exchange resin. After shaking the sample for a certain time, an aliquot of the aqueous phase was precisely taken, which were subjected to $$gamma$$-spectrometry. The complex formation of Zr and Hf reached to chemical equlibria at 180 min. Distribution coefficients of Zr and Hf were decreased with an increase of the concentration of $$alpha$$-HiB, indicating the consecutive complexation of these ions with $$alpha$$-HiB. On the other hand, Th was adsorbed on the cation-exchange resin under the given conditions, showing clearly different behavior of Th from that of Zr and Hf.

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