Evaluation of iodine speciation and 129I/127I ratios at low concentrations in environmental samples using IC-ICP-MS

Subterranean radioiodine contamination at the Hanford Site in Washington State is believed to be present as iodide, iodate, and organo-I species, with iodate being the predominant form. Because these species have different sediment-sorption characteristics, understanding their distribution is import...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2021, Vol.327 (2), p.929-937
Main Authors: Kimmig, Sara R., Thompson, Christopher, Baum, Steven, Brown, Christopher F.
Format: Article
Language:English
Subjects:
Argon
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Drinking water
Groundwater
Hadrons
Heavy Ions
Inductively coupled plasma mass spectrometry
Inorganic Chemistry
Iodine
Iodine 131
Low concentrations
Mass spectrometry
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
Sediments
Speciation
Standard reference materials
Water sampling
Xenon 129
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Summary:Subterranean radioiodine contamination at the Hanford Site in Washington State is believed to be present as iodide, iodate, and organo-I species, with iodate being the predominant form. Because these species have different sediment-sorption characteristics, understanding their distribution is important for developing an accurate understanding of iodine migration in the subsurface. Herein, we report a novel, rapid technique for simultaneous iodine speciation (iodide/iodate) and isotopic ratio ( 129 I/ 127 I) measurements using ion chromatography (IC) joined with collision/reaction cell inductively coupled plasma mass spectrometry (ICP-MS), collectively referred to as IC-ICP-MS. This approach employs online dynamically regenerated eluent suppression post chromatographic separation of the samples and collision cell technology, with pure oxygen as a collision gas for the active suppression of 129 Xe (which naturally exists in the argon supplied to the ICP source) to rapidly (
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-020-07537-3