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Trace Elemental Analysis of Bulk Thorium Using an Automated Separation-Inductively Coupled Plasma Optical Emission Spectroscopy Methodology.

Authors
  • Manard, Benjamin T1
  • Metzger, Shalina C1
  • Wysor, Sarah K1
  • Bradley, Veronica C1, 2
  • Roach, Benjamin D1
  • Zirakparvar, N Alex1
  • Rogers, Kayron T1
  • Bostick, Debra A1
  • Ticknor, Brian W1
  • Hexel, Cole R1
  • 1 Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
  • 2 Department of Chemistry, University of Missouri, Columbia, MO, USA.
Type
Published Article
Journal
Applied Spectroscopy
Publisher
SAGE Publications
Publication Date
May 01, 2021
Volume
75
Issue
5
Pages
556–564
Identifiers
DOI: 10.1177/0003702820961390
PMID: 33030968
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Presented here is a novel automated method for determining the trace element composition of bulk thorium by inductively coupled plasma-optical emission spectroscopy (ICP-OES). ICP-OES is a universal approach for measuring the trace elemental impurities present in actinide-rich materials; however, due to the emission rich spectrum of the actinide, a separation from the trace elements is warranted for spectrochemical analysis. Here, AG MP-1 ion exchange resin was utilized for retention of the Th matrix, while allowing the trace element impurities to be separated prior to subsequent analysis using ICP-OES. After demonstrating the separation on traditional gravity-driven columns, the methodology was transitioned to an automated platform for comparison. This automated platform utilizes syringe-driven sample and solvent flow and can collect the trace element and thorium fractions in separate locations. While reducing the sample size (500 µL, 1.5 mg of Th), maintaining the overall separation efficiency (recoveries >95%), and illustrating the sample throughput ability (n = 10+), this automated methodology could be readily adopted to nuclear facilities in which the determination of trace elemental impurities in Th samples is warranted.

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