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- W2056547217 abstract "The partitioning behavior of the pertechnetate anion was studied in aqueous biphasic systems (ABS) formed from (NH4)2SO4 and four types of polymers – poly(ethylene glycol) (PEG), poly(propylene glycol) (PPG), Pluronic (a PEG/PPG block copolymer), and polyvinylpyrrolidone (PVP). Phase diagrams are reported for five (NH4)2SO4-polymer ABS systems including the polymers PEG-2000, PEG-3400, PEG-12 000, Pluronic-L64 (average molecular mass ≈ 2900), and PVP-K15 (average Mr≈10 000). Distribution ratios for the TcO4− anion in each of these ABS were investigated as a function of increasing salt concentration. In addition, the water-insoluble polymer PPG-2000 was studied. Pertechnetate partitions nearly quantitatively to the polymer-rich phase in each ABS, however, distribution ratios of near one were found for the PPG system. The relative ordering of the distribution ratios is PPG⪡PVP⪡-2000<PEG-3400≈PEG-12 000<Pluronic-L64. For the three PEG-ABS systems, distribution ratios of the sulfate of the sulfate anion decrease in the order PEG-2000>PEG-3400>PEG-12 000, exhibiting the expected increase in phase incompatibility with increasing polymer Mr. Investigation of pertechnetate partitioning in two additional ABS based on K3PO4 and NaOH with Pluronic-L64 revealed trends similar to those reported for PEG-2000; the distribution ratio (D) values increase in the order NaOH<(NH4)2SO4<K3PO4. Despite the higher distribution ratios from Pluronic-L64 at lower concentrations than found for PEG, the limited useable range of salt concentrations available may limit the practical utilization of this polymer in ABS separations." @default.
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- W2056547217 date "1996-05-01" @default.
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- W2056547217 title "Effects of increasing polymer hydrophobicity on distribution ratios of TcO4− in polyethylene/poly(propylene glycol)-based aqueous biphasic systems" @default.
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- W2056547217 doi "https://doi.org/10.1016/0378-4347(95)00389-4" @default.
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