New technologies for metal ion separations: aqueous biphasic extraction chromatography (ABEC). Part 1. Uptake of pertechnetate

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299608918376· OSTI ID:374493

Rogers, R D; Bond, A H; Griffin, S T ^[1]; Horwitz, E P ^[2]

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1. Northern Illinois Univ., DeKalb, IL (United States)
2. Argonne National Lab., IL (United States)

Polyethylene glycol (PEG) based-aqueous biphasic systems (ABS) have been adapted to a solid aqueous biphasic extraction chromatographic (ABEC) mode by grafting high molecular weight PEGs to a solid support and using high ionic strength salt solutions as mobile phases. The new resins behave as an ABS: in the presence of high ionic strength solutions of water-structuring anions (e.g., SO{sub 4}{sup 2-}, CO{sub 3}{sup 2-}, OH{sup -}, etc.), chaotropic ions (e.g., TcO{sub 4}{sup -}) are retained. Stripping is accomplished by washing the resins with water, thus lowering the ionic strength and no longer mimicking an ABS environment. Monomethylated PEGs (Me-PEGs) of average molecular weight 350, 750, 2000, and 5000 have been grafted to chloromethylated polystyrene-l%-divinylbenzene. Quantitative uptake of tracer-scale pertechnetate has been achieved from NaOH, (NH{sub 4}){sub 2}SO{sub 4}, K{sub 2}CO{sub 3} and K{sub 3}PO{sub 4} for the two higher molecular weight PEG resins, with retention increasing as the molecular weight of the grafted Me-PEG increases. No uptake is observed from water. 55 refs., 6 figs.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 374493
• Journal Information: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 5 Vol. 14; ISSN 0736-6299; ISSN SEIEDB
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
CARBONATES
DISTRIBUTION FUNCTIONS
HYDROXYL RADICALS
METALS
MOLECULAR WEIGHT
POLYETHYLENE GLYCOLS
POLYMERS
SOLVENT EXTRACTION
SULFATES
TECHNETATES
TECHNETIUM OXIDES