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Extraction Selectivity of a Quaternary Alkylammonium Salt for Trivalent Actinides over Trivalent Lanthanides: Does Extractant Aggregation Play a Role?

Journal Article · · Solvent Extraction and Ion Exchange
 [1];  [2];  [2]
  1. Univ. of Iowa, Iowa City, IA (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)

In this paper, the extraction behavior of a quaternary alkylammonium salt extractant was investigated for its selectivity for trivalent actinides over trivalent lanthanides in nitrate and thiocyanate media. The selectivity was evaluated by solvent extraction experiments through radiochemical analysis of 241Am and 152/154Eu. Solvent extraction distribution and slope-analysis experiments were performed with americium(III) and europium(III) with respect to the ligand (nitrate and thiocyanate), extractant, and metal (europium only) concentrations. Further evaluation of the equilibrium expression that governs the extraction process indicated the appropriate use of the saturation method for estimation of the aggregation state of quaternary ammonium extractants in the organic phase. From the saturation method, we observed an average aggregation number of 5.4 ± 0.8 and 8.5 ± 0.9 monomers/aggregate for nitrate and thiocyanate, respectively. Through a side-by-side comparison of the nitrate and thiocyanate forms, we discuss the potential role of the aggregation in the increased selectivity for trivalent actinides over trivalent lanthanides in thiocyanate media.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1389552
Journal Information:
Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 4 Vol. 35; ISSN 0736-6299
Publisher:
Taylor and FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

The coordination chemistry of Cm III , Am III , and Ac III in nitrate solutions: an actinide L 3 -edge EXAFS study journal January 2018
Thiocyanate complexes of the lanthanides, Am and Cm journal January 2020

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