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

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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]
Copyright of Solvent Extraction & Ion Exchange is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubTypeId: academicJournal
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  Data: Pyridine Polyaminocarboxylate Ligands for Use as Actinide-selective Holdback Reagents in Simplified TALSPEAK-like Extraction Systems.
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  Data: <searchLink fieldCode="AR" term="%22E%2E+F%2E+Uhnak%2C+Nicolas%22">E. F. Uhnak, Nicolas</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nash%2C+Kenneth+L%2E%22">Nash, Kenneth L.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> knash@wsu.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Solvent+Extraction+%26+Ion+Exchange%22">Solvent Extraction & Ion Exchange</searchLink>. 2020, Vol. 38 Issue 4, p401-416. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Rare+earth+metals%22">Rare earth metals</searchLink><br /><searchLink fieldCode="DE" term="%22Ligands+%28Chemistry%29%22">Ligands (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactive+tracers%22">Radioactive tracers</searchLink><br /><searchLink fieldCode="DE" term="%22Pyridine%22">Pyridine</searchLink><br /><searchLink fieldCode="DE" term="%22Thorium+isotopes%22">Thorium isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Solvent+extraction%22">Solvent extraction</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Solvent Extraction & Ion Exchange is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1080/07366299.2020.1741124
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 401
    Subjects:
      – SubjectFull: Rare earth metals
        Type: general
      – SubjectFull: Ligands (Chemistry)
        Type: general
      – SubjectFull: Radioactive tracers
        Type: general
      – SubjectFull: Pyridine
        Type: general
      – SubjectFull: Thorium isotopes
        Type: general
      – SubjectFull: Solvent extraction
        Type: general
    Titles:
      – TitleFull: Pyridine Polyaminocarboxylate Ligands for Use as Actinide-selective Holdback Reagents in Simplified TALSPEAK-like Extraction Systems.
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            NameFull: Nash, Kenneth L.
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              M: 07
              Text: 2020
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              Y: 2020
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              Value: 38
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            – TitleFull: Solvent Extraction & Ion Exchange
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