A short review is given on our current anion-exchange studies of element 104, rutherfordium (Rf), in HCI and HNO3 solutions. The distribution coefficients of the Rf homologues Zr, Hf, and Th(IV), and Pu(IV) on an anion-exchange resin were measured in 1.0-11.5 M HC1 and 1.1-13.1 M HNO3 with a batch method using the radiotracers Zr, Hf, Th, and Pu. In experiments for the short-lived Rf, the isotopes Zr, Hf, and Rf were produced in the O-induced reactions on Ge, Gd, and Cm targets, respectively, and their anion-exchange behavior in 4.0-11.5 M HCI and 8.0 M HNO3 was investigated using the Automated Ion-exchange separation apparatus coupled with the Detection system for Alpha spectroscopy (AIDA). In the HCl system, the percent adsorption of Rf on the anion-exchange resin increases steeply with increasing HCl concentration from 7.0 M to 11.5 M. This adsorption behavior is similar to that of the group-4 elements Zr and Hf, and is quite different from that of the pseudo-homologue Th(IV). The percent adsorption decreases in the order Rf>Zr>Hf.In the HNO3 system, Rf behaves like Zr and Hf in 8.0 M HNO3 but not like Pu(IV) and Th(IV), implying the formation of cationic or neutral species.

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