Abstract
Aqueous perfluorooctanoate (PFOA−) solution of water-miscible organic solvent (SOLV), such as dioxane and acetone, was separated into two immiscible phases reversibly by charge neutralization of PFOA− ion with proton (H+) (pKa value of HPFOA was 1.01, atI = 0.1, 20 °C). The transparent heavier phase, in which HPFOA was concentrated quantitatively, consisted of three components in the molar ratio of HPFOA∶SOLV∶H2O = 1∶4.0∶6.6 for acetone system, and 1∶0.47∶1.9 for dioxane system, respectively. This separation provides a new homogeneous liquid-liquid extraction method, which can be successfully applied to the ultra-high preconcentration of water-soluble porphyrin compounds: 104-fold concentration was achieved within 20 min.
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Igarashi, S., Yotsuyanagi, T. Homogeneous liquid-liquid extraction by pH dependent phase separation with a fluorocarbon ionic surfactant and its application to the preconcentration of porphyrin compounds. Mikrochim Acta 106, 37–44 (1992). https://doi.org/10.1007/BF01242697
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DOI: https://doi.org/10.1007/BF01242697