Model Studies for the Separation and Identification of Element 107 (Bohrium, Bh): Ion Exchange and Precipitation Experiments with Tc, Re, Nb and Ta Nuclides from HNO₃/HF containing Aqueous Solution

Abstract

Ion exchange on cation exchange resins from diluted HNO3/HF solutions proved to be a suitable method for the separation of the group 7 elements Tc and Re from the group 5 elements Nb and Ta. To achieve a good separation the columns were heated to 75 °C. The Tc/Re fraction then was precipitated onto a nucleopore filter in form of tetraphenylarsoniumperrhenate (PhiAsReOJ adding small amounts of Re as carrier. The separation procedure was completed after 10-15 s.

Anion Exchange Behavior Of Ti, Zr, Hf, Nb And Ta As Homologues Of Rf And Db In Mixed HF—Acetone Solutions

“…88 Zr and 92 Nb prepared by irradiation of Sr and Y (natural isotope abundance) with α particles (initial energy 35 MeV, He + beam current ∼ 10 μA, exposure time 4 hours) on U-200 accelerator (FLNR). Production and radiochemical puriˇcation of 88 Zr were performed as described in [6] and for 92 Nb by analogy with [7].…”