Analysis of Urea Nitrogen in the Presence of Ammonia Using an Ammonia Gas Sensitive Electrode

Abstract

Abstract This report describes a method for the determination of ammonia and urea in raw sewage samples using an Orion Ammonia Gas-Sensing Electrode. Urea is determined by potentiometrically measuring the ammonia produced following exhaustive hydrolysis by urease and subtracting the amount of ammonia present before enzymatic hydrolysis. The recovery of urea from raw sewage samples using the procedure herein described is shown to be nearly Quantitative.