Sensing of Poly(styrenesulfonate)s by Polymeric Membrane Electrodes Based on Liquid Anion-Exchangers.

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  • Ohki Akira
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University
  • Tsurugasaki Masato
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University
  • Kondo Yasunori
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University
  • Naka Kensuke
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University
  • Maeda Shigeru
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University

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  • Sensing of Poly styrenesulfonate s by P

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The potentiometric responses of ion-selective electrodes (ISEs) based on various liquid anion-exchangers for poly(styrenesulfonate)s (PSSs) were examined. The liquid anion-exchangers included lipophilic monoammonium, monophosphonium, diphosphonium, and triphosphonium salts. The molecular weights of PSSs, which had narrow molecular-weight distributions (Mw/Mn < 1.2), were varied from 1.8 × 103 (PSS-1.8K) to 3.5 × 104 (PSS-35K). For PSS-1.8K, ISEs based on diphosphonium salts, polymethylenebis(trioctylphosphonium) dibromides 1—3, exhibited good responses, the response slope and linear response range being −20 to −21 mV/decade and 5.0 × 10−5—5.0 × 10−3equiv dm−3, respectively. As the molecular weight of PSS was increased, the linear response range became smaller, while the response slope was almost constant. Finally, PSS-35K gave almost no response. On the other hand, a wide molecular-weight distribution PSS (Mw/Mn = 3.6) provided a good response, although it had a high average molecular weight (Mw = 1.6 × 104). The selectivity coefficients for PSS over various anions of ISEs, based on diphosphonium and monophosphonium salts, were assessed.

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