Abstract
To find suitable conditions for the experimental study of anion-exchange behavior of element 105, dubnium (Db), we have investigated anion-exchange behavior of the group-5 elements Nb, Ta, and their pseudo homologue Pa in HF/HNO3 media by a batch method using radiotracers of 95Nb, 179Ta, and 233Pa. Clearly different adsorption behavior was observed among those homologues in the fluoride ion concentrations of 1 × 10-6 M < [F-] < 2 × 10-2 M, suggesting that each element forms different anionic complexes. Based on the observed distribution coefficients of these elements, we propose appropriate experimental conditions to investigate fluoride complexation of Db.
