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Journal Articles

Sulfate complexation of element 104, Rf, in H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution

Li, Z.*; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Kikuchi, Takahiro; Nagame, Yuichiro; Sch$"a$del, M.; Pershina, V.*; et al.

Radiochimica Acta, 100(3), p.157 - 164, 2012/03

 Times Cited Count:9 Percentile:34.7(Chemistry, Inorganic & Nuclear)

Oral presentation

Sulfate complexation of element 104, Rf, in H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution ([H$$^{+}$$] = 1.0 M)

Li, Z.; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Kikuchi, Takahiro; Sch$"a$del, M.*; Nagame, Yuichiro; Liang, X. H.*; et al.

no journal, , 

Cation-exchange behavior of $$^{261}$$Rf (T$$_{1/2}$$ = 78 s) produced in the $$^{248}$$Cm($$^{18}$$O, 5n) reaction was studied on a "one-atom-at-a-time" scale in H$$_{2}$$SO$$_{4}$$ (0.15-0.69 M)/HNO$$_{3}$$ mixed solutions ([H$$^{+}$$] = 1.0 M) using an automated ion-exchange separation apparatus coupled with the detection system for alpha-spectroscopy. It was found that adsorption probability (%ads) of $$^{261}$$Rf on cation-exchange resin decreases with increasing [HSO$$_{4}$$$$^{-}$$], showing a successive formation of its sulfate complexes. Rf exhibited much weaker formation of the complexes than the lighter homologues Zr and Hf, which is qualitatively in good agreement with theoretical calculations including relativistic effects.

Oral presentation

Study on the adsorption rate of Zr and Hf as homologues of element 104, Rutherfordium, on the cation-exchange resin in H$$_{2}$$SO$$_{4}$$ solutions

Ikarashi, Satoshi*; Sueki, Keisuke*; Tsukada, Kazuaki; Nagame, Yuichiro

no journal, , 

The adsorption rates of Zr and Hf on the cation-exchange resin in H$$_{2}$$SO$$_{4}$$ solutions were investigated in order to lead to the quantitative discussion of the chromatography. It was obtained the adsorption rates of $$^{88}$$Zr and $$^{175}$$Hf on the cation-exchange resin in 0.1 M H$$_{2}$$SO$$_{4}$$ at 15, 25 and 45$$^{circ}$$C as functions of the shaking times. The results showed that the equilibrium of cation-exchange was reached at 70$$sim$$80 seconds and that the adsorption rates on the cation-exchange resin were not changed between 15$$sim$$45$$^{circ}$$C in the present condition. In H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution ([H$$^{+}$$]$$_{eq}$$ = 1.0 M), the adsorption rate was similar to those of $$^{88}$$Zr and $$^{175}$$Hf on the cation-exchange resin in H$$_{2}$$SO$$_{4}$$ solution.

Oral presentation

Cation-exchange behavior of element 104, Rf, in H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution ([H$$^{+}$$] = 1.0 M)

Li, Z.; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Sch$"a$del, M.*; Nagame, Yuichiro; Liang, X. H.*; Kasamatsu, Yoshitaka*; et al.

no journal, , 

Cation-exchange behavior of $$^{261}$$Rf (T$$_{1/2}$$ = 78 s) produced in the $$^{248}$$Cm($$^{18}$$O,5n) reaction was studied on a "one-atom-at-a-time" scale in 0.15-0.69 M H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solutions ([H$$^{+}$$] = 1.0 M) using an automated ion-exchange separation apparatus coupled with a detection system for alpha-spectroscopy (AIDA). It was found that adsorption probabilities (%ads) of Rf on the cation-exchange resin decrease with increasing [HSO$$_{4}$$$$^{-}$$], showing successive formation of Rf sulfate complexes. Rf exhibits a weaker complex formation than the lighter homologues Zr and Hf.

Oral presentation

Study on cation-exchange kinetics of Zr and Hf as homologues of $$_{104}$$Rf with H$$_{2}$$SO$$_{4}$$ solutions

Ikarashi, Satoshi*; Sueki, Keisuke*; Li, Z.*; Tsukada, Kazuaki; Nagame, Yuichiro

no journal, , 

To study ion-exchange kinetics on the diffusion processes of Rf and its homologues, Zr and Hf, with the cation-exchange resin in H$$_{2}$$SO$$_{4}$$ solutions, we obtained the fractional attainment of equilibrium of the carrier-free radiotracers $$^{88}$$Zr and $$^{175}$$Hf adsorbed on the cation-exchange resin as a function of contact time within 300 seconds by the batch experiment. We discussed the dependence of functions of the fractional attainment of equilibrium on temperatures, concentrations of HSO$$_{4}$$- and radii of resins. It is result that the good agreement between experimental data and theoretical curves which the film diffusion control is the rate-determining step in the present ion-exchange process.

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