Determination of Ammonium ion in urine using an ammonium ion-selective electrode

Arben Merkoçi, V.Çoçoli, B.Baraj, S.Buzo. Acta Chimica Hungarica-Models in Chemistry, 130, p. 19 (1993)

The factorial design is used to study interferences of [K+] and pH during ammonium determi nation by NH4-ISE. It is concluded that as result of a negative pH-[K+] interactive interference the positive interference of [K+] may be diminished. The optimal pH for NH4+ determination is 7.4. A complete procedure is presented to diminish the interferences of [K+] and pH. Parallelly an indirect method is used for the determination of total ammonium in urine.