Pyridine Polyaminocarboxylate Ligands for Use as Actinide-selective Holdback Reagents in Simplified TALSPEAK-like Extraction Systems

Uhnak, Nicolas E.; Nash, Kenneth

doi:10.1080/07366299.2020.1741124

Pyridine Polyaminocarboxylate Ligands for Use as Actinide-selective Holdback Reagents in Simplified TALSPEAK-like Extraction Systems

Journal Article · Sat Jun 06 04:00:00 EDT 2020 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299.2020.1741124· OSTI ID:1757982

Uhnak, Nicolas E. ^[1]; Nash, Kenneth ^[2]

BATTELLE (PACIFIC NW LAB)
Washington State University

Three pyridine-based aqueous complexants have been synthesized and used in an unbuffered TALSPEAK (Trivalent Actinide Lanthanide Separation by Phosphorus-reagent from Aqueous Komplexes) separation system as minor 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 separation factors for Eu were found to be > 70 for all three ligands and > 15 for Nd. Aqueous pyridine based ligands represent viable alternatives for traditional actinide-selective holdback reagents in TALSPEAK-based systems.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1757982

Report Number(s):: PNNL-SA-147107

Journal Information:: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 4 Vol. 38

Country of Publication:: United States

Language:: English

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pyridine
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solvent extraction

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