Solvent Extraction Behavior of Inorganic Ions in the Alkylamines-hydrochloric Acid Systems Amberlite LA-1 and tri-iso-octylamine

Abstract

The extraction behavior of more than 60 chemical elements in the systems of 10 % Amberlite LA-1 xylene solution vs. hydrochloric acid and 5% tri-iso-octylamine xylene solution vs. hydrochloric acid is presented and discussed, the acidity being varied from 1 to 12M. The distribution ratio, Kd, of the particular nuclide was determined by the use of radioactive tracer. Although the shapes of the acid dependence curves for each element resemble each other in the two systems, yet the Kd values in the TIOA system are generally higher than those obtained in Amberlite LA-1. The same regularity is to be noticed for the relationship between the Kd values of the elements at a definite acidity and their respective atomic number, Z, in the two systems examined. By comparison with the TBP-HCI, or the anion exchange resin-HCI systems, it is to be found that amines give acid and Z dependence curves quite analogous to those of the two former systems. The higher Kd values for scandium and heavier rare earth elements in the TBP-HCI system are, however, a rare exception.

Development of an automated batch-type solid-liquid extraction apparatus and extraction of Zr, Hf, and Th by triisooctylamine from HCl solutions for chemistry of element 104, Rf

“…In this work, we chose the triisooctylamine (TIOA)/ hydrochloric acid (HCl) extraction system [20,21] for the study of the chloride complex formation of Rf, because fast extraction of the anionic species is expected for the ion-pair extractant TIOA [22]. We investigated the time required to reach equilibrium in solid-liquid extraction for Zr, Hf, and Th, and examined variations in their d values in equilibrium for different HCl and TIOA concentrations by "offline" batch method.…”

Solvent Extraction of Zirconium and Hafnium as Homologues of Rutherfordium by Triisooctylamine from HCl Solutions

“…The ion-association extractant, TIOA, was selected because of the rapid extraction of the anionic species [11]. In a previous solvent extraction experiment using TIOA [12], macro amounts of Zr and Hf were used and thus these data are not suitable for comparison purposes with those of the transactinides. In another experiment in the TIOA/HCl system using carrier-free Zr and Th tracers [13], it is unclear whether the data were obtained under extraction equilibrium conditions because the mixing time of the 2 phases was fixed at 2 min (most likely in an attempt to obtain data directly MeV for Zr and 14 MeV for Hf were delivered by the AVF cyclotron at the Research Center for Nuclear Physics, Osaka University.…”