Bibliographic Details
| Title: |
Pyridine Polyaminocarboxylate Ligands for Use as Actinide-selective Holdback Reagents in Simplified TALSPEAK-like Extraction Systems. |
| Authors: |
E. F. Uhnak, Nicolas1,2 (AUTHOR), Nash, Kenneth L.2 (AUTHOR) knash@wsu.edu |
| Source: |
Solvent Extraction & Ion Exchange. 2020, Vol. 38 Issue 4, p401-416. 16p. |
| Subjects: |
Rare earth metals, Ligands (Chemistry), Radioactive tracers, Pyridine, Thorium isotopes, Solvent extraction |
| Abstract: |
Three pyridine-based aqueous complexants have been synthesized and evaluated for their utility in an unbuffered TALSPEAK (Trivalent Actinide Lanthanide Separation by Phosphorus-reagent Extraction from Aqueous Komplexes) separation system as trivalent actinide-selective holdback reagents. The selectivity was established based on distribution studies using radiotracer 152/154Eu, 241Am, stable Ln, Y, and Th. In this system, these ligands selectively sequester Am from the lanthanides without the need for a secondary pH buffer. Am-lanthanide single-stage separation factors for Eu were found to be >70 for all three ligands and >15 for Nd. The results demonstrate that aqueous pyridine-based ligands represent viable alternatives to conventional aminopolycarboxylate complexants as actinide-selective holdback reagents in TALSPEAK-based actinide-lanthanide separation systems. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
