Abstract
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 language | English |
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Pages (from-to) | 419-423 |
Journal | Anal. Chim. Acta |
Volume | 261 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 25 May 1992 |
Keywords
- Flow system
- Ion-selective electrodes
- Ion-sensitive field -effect transistors
- Nitrate
- pH
- Potentiometry