A Novel Amperometric Ammonia Sensor

Abstract

A novel amperometric ammonia sensor was designed in which an amperometric ammonium-ion selective polyvinyl chloride)-nitrobenzene gel electrode containing dibenzo- 18-crown-6 was covered with a gas-permeable membrane. This sensor gave a current response proportional to the ammonia concentration in the range from 2 to 200μmol dm^-3. We examined the dependence of the current response on electrode potential, thickness of the internal- solution layer, and pH of the sample solution. The results were well explained by theoretical equations.