Analysis of semivolatile organics in liquid radioactive residue using sorptive stir bar and solvent back-extraction

Boggess, Andrew J.; White, Thomas L.

doi:10.1016/j.chroma.2025.466167

Analysis of semivolatile organics in liquid radioactive residue using sorptive stir bar and solvent back-extraction

Journal Article · Sun Aug 31 20:00:00 EDT 2025 · Journal of Chromatography A

DOI:https://doi.org/10.1016/j.chroma.2025.466167· OSTI ID:3012830

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Savannah River National Laboratory (SRNL), Aiken, SC (United States)

Current methods for semivolatiles analysis in radioactive samples can produce large volumes of radioactive solvent residue. A method utilizing stir-bar sorptive extraction has been explored in this work for its applicability to radioactive waste samples. This low solvent analytical method may accelerate remediation, minimize hazardous solvent waste, and reduce exposure risk to workers. Organic compounds (polyaromatic hydrocarbons, chlorinated aromatics, and phenolic compounds) were chosen as surrogates for common Liquid Waste System (LWS) contaminants at Savannah River Site (Aiken, SC). Stir-bar extraction parameters (extraction time, matrix modification, and effective pH range) and solvent back extraction parameters (solvent type, volume, and extraction time) were optimized experimentally for the chosen compounds. Affinity of the stir-bar extraction polymer to radionuclides Cs-137 and Am-241 was observed to determine radionuclide concentration effects. The stir-bar method achieved mean recovery of 100 ± 0.7% (1σ), relative to 114 ± 7% using solvent extraction, while reducing weekly method hands-on time by 93.4% and solvent volume consumption by 99.3%. Sensitivity was improved by 378% in simulated tank waste and 278% in real-world LWS matrix, relative to solvent extraction. This work has produced a safe and optimized method for the low solvent analysis of organics in legacy radioactive tank waste by stir-bar sorptive extraction.

View Accepted Manuscript (DOE)

Research Organization:: Savannah River National Laboratory (SRNL), Aiken, SC (United States)

Sponsoring Organization:: Savannah River National Laboratory; Laboratory Directed Research and Development; Office of Environmental Management; U.S. Department of Energy

Grant/Contract Number:: 89303321CEM000080

OSTI ID:: 3012830

Journal Information:: Journal of Chromatography A, Journal Name: Journal of Chromatography A Vol. 1758; ISSN 0021-9673

Publisher:: Elsevier BVCopyright Statement

Country of Publication:: United States

Language:: English

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