Response of a lead ion selective electrode in water-alcohol systems at different temperatures

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  • SAKURA Sachiko
  • ICHINOSE Norio
    Department of Chemistry, Faculty of Medicine, Hamamatsu University School of Medicine
  • SAKURAI Nobuo
    Department of Hygiene, Faculty of Medicine, Hamamatsu University School of Medicine
  • SATO Gen P.
    Department of Chemistry, Faculty of Science and Technology, Sophia University

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Other Title
  • 種々の温度における水‐アルコール類混合溶媒系中の鉛イオン選択性電極の応答性
  • 種々の温度における水-アルコール類混合溶媒系中の鉛イオン選択性電極の応答性
  • シュジュ ノ オンド ニ オケル ミズ アルコールルイ コンゴウ ヨウバイケイ

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Description

The response of an Orion Lead Electrode 94-82A at 10.0 °C, 25.0 °C, 35.0 °C, 45.0 °C and 50.0 °C(± 0.05 °C) was examined in aqueous 0.1 mol dm-3 KNO3 systems containing alcohols (methanol, ethanol, 1-propanol, ethylene glycol and glycerol). The results were conveniently analyzed by means of a new type of plot in which (2F/2.303 RT) x (E-E_??_) is plotted against log([Pb2+]/c_??_), where E is the potential of the electrode when lead ion concentration is [Pb2+], E_??_ is the potential observed ([Pb2+]=c_??_), and the other symbols have their usual meanings. The advantage of this plot is that it gives a straight line with a slope of 1 passing through the origin when the response is nernstian irrespective of temperature and junction potential, if c_??_ is rightly chosen. In the present case the value of c_??_ was 10-3 mol dm-3. At lead ion concentrations ranging between 1 and 10 mmol dm-3 the response was nernstian in every case. At concentrations lower than a certain limit, which was around (10-410-5) mol dm-3 in the majority of cases, the magnitude |E-E_??_| became smaller than the ideal response. Some samples of 1-propanol contained unknown impurities that interfered with the response of the electrode.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 29 (10), 659-663, 1980

    The Japan Society for Analytical Chemistry

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