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Analysis of Glycolate in Radioactive Waste by Ion Chromatography (IC) and Proton Nuclear Magnetic Resonance (H NMR)

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Abstract

In preparation for implementing the Nitric-Glycolic (NG) acid flowsheet for the Savannah River Site (SRS) Liquid Waste System (LWS), analytical methods for determining glycolate at low concentration, below 20 mg/L in radioactive samples, were developed to support system management and safety. To accommodate the wide range of LWS matrix conditions, two alternative methods were developed, refined, and demonstrated for glycolate analysis in radioactive waste samples: ion chromatography (IC) and a proton nuclear magnetic resonance (H NMR). Investigators validated IC and H NMR methods for glycolate analysis, defined the range of applicability, and demonstrated key supporting analytical protocols. The deployed IC method is applicable in low to moderate ionic strength samples and requires sample pretreatment using a Dionex OnGuard II H+ cartridge. The deployed H NMR method is more labor intensive but provides options for a broader range of matrices. Based on the results, high quality glycolate analysis of the Defense Waste Processing Facility (DWPF) condensate in Tank 22 is feasible by IC down to approximately 12 mg/L. Using H NMR, glycolate may be determined to 8 mg/L or lower depending on the run time with the potential for broader applicability of the method to higher ionic strength conditions in other tanks of the SRS LWS.

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Acknowledgements

The authors would like to acknowledge Stephanie Craig for ion chromatography analyses and Shirley McCollum for help with NMR samples. Thank you for your contributions to this publication.

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  1. Savannah River National Laboratory (SRNL), Building 773-A, 29808, Aiken, SC, USA

    Thomas L. White, Charles J. Coleman, David D. DiPrete, Brian B. Looney & Fernando F. Fondeur

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  1. Thomas L. White
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  2. Charles J. Coleman
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  3. David D. DiPrete
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  4. Brian B. Looney
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  5. Fernando F. Fondeur
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Correspondence to Thomas L. White.

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White, T.L., Coleman, C.J., DiPrete, D.D. et al. Analysis of Glycolate in Radioactive Waste by Ion Chromatography (IC) and Proton Nuclear Magnetic Resonance (H NMR). J Radioanal Nucl Chem 331, 4837–4849 (2022). https://doi.org/10.1007/s10967-022-08507-7

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  • DOI: https://doi.org/10.1007/s10967-022-08507-7

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