Determination of Ammonia by Designing an Optode Based on Immobilization of a Co(III)-Schiff Base Complex on a Triacetylcelluose Membrane

Abstract

Abstract A novel ammonia optode was designed using [4-methyl-N,N′-bis(salicylidene)-1,2-phenylenediamine] tributylphosphincobalt(III) perchlorate monohydrate [Co(4-MeSaloph)(PBu)3]+ complex coated on a triacetylcellulose membrane. The sensor could be used at a wavelength of 378 nm to detect ammonia in the range of 8.3 × 10–4 and –1.25 × 10–2 M in borate buffer(pH 10). The LOD was found to be 9.5 × 10–5 M. The response time of the optode was 2–3 min and depended on the concentration of ammonia. This optode was successfully applied for the determination of ammonia in drinking water.