Nitrate ion-selective electrode as reference electrode for flow-injection analysis

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The development of a flow-injection system for pH determination using a pH ion-sensitive field-effect transistor in conjuction with a tubular flor-through nitrate ion-selective electrode (ISE) as a reference electrode is described. With this system, the linear working range extends from pH 1 to 13 with a sensitivity of 56 mV per pH unit and a relative standard deviation of 0.4%. A stable baseline and good respose are obtained by placing the tubular ISE in a closed branch of the main channel. © 1992.
Original languageEnglish
Pages (from-to)419-423
JournalAnal. Chim. Acta
Issue number1-2
Publication statusPublished - 25 May 1992


  • Flow system
  • Ion-selective electrodes
  • Ion-sensitive field -effect transistors
  • Nitrate
  • pH
  • Potentiometry


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