Gas-Sensing Membrane Electrodes for the Determination of Dissolved Gases (I). Continuous-Automated Determination of Nitrite Ion Using Tubular PVC Membrane Type of pH Electrode

A continuous-automated method for the determination of nitrite ion using gas-sensing membrane electrode was developed. The pH electrode of tubular PVC membrane type was used as a detector of this system. The slope of linear response of the electrode measured at optimum conditions for the continuous-automated determination of nitrite ion was 63.5 mV/decade. The concentration range of linear response and detection limit were 2.5 M and M, respectively. This detection system was not only less interfering to acidic gas species than other methods but also less time consumable for determination.