PERFORMANCE-CHARACTERISTICS AND SOME APPLICATIONS OF THE NITROGEN-OXIDE GAS SENSOR

The performance characteristics of nitrogen oxide gas sensor with regard to the origin of response, limit of detection, response time, influence of the membrane type, and selectivity have been systematically examined. Optimum conditions for direct potentiometric determination of as low as 0. 1 mu mol mL** minus **1 nitrite are described and results with an average recovery of 98. 2% (standard deviation plus or minus 0. 3%) are obtained. The sensor is also used to monitor direct titration of micromole per liter quantities of primary aryl amines, hydrazines, and azide with sodium nitrite or sodium cobaltinitrite. Results with an average recovery of 98. 3% (standard deviation plus or minus 1. 3%) are obtainable without any significant interference from 1000-fold molar excess of amides, imides, anilides, tertiary amines, and quaternary ammonium salts.