INQUINOA   21218
INSTITUTO DE QUIMICA DEL NOROESTE
Unidad Ejecutora - UE
artículos
Título:
Ammonia sensor based on propylene carbonate
Autor/es:
B.A.LÓPEZ DE MISHIMA, H.T.MISHIMA
Revista:
SENSORS AND ACTUATORS B-CHEMICAL
Editorial:
Elsevier ( on line 12 de noviembre del 2007
Referencias:
Lugar: Amsterdam; Año: 2008 vol. 131 p. 236 - 240
ISSN:
0925-4005
Resumen:
Ammonia sensor based on propylene carbonate B.A. Lopez de Mishima∗, H.T. Mishima Instituto de Ciencias Quimicas, F.A.A., Universidad Nacional de Santiago del Estero, Avda. Belgrano (s) 1912, 4200 Santiago del Estero, Argentina Received 28 May 2007; received in revised form 2 November 2007; accepted 12 November 2007 Available online 21 November 2007 Abstract The electrochemical oxidation of ammonia was studied at room temperature on a platinum black electrode in tetrabutylammonia hexafluorophophate solutions in propylene carbonate solvent. Potentiodynamic experiments and current–time curves at constant potential in a glass cell and a sensor device were performed. From the current–time curves the stationary density current values were obtained, which were proportional to the ammonia concentration in the range necessary for the functioning of the sensor (50–200 ppm). The stability of the sensor and the response to the change of the ammonia concentration were also measured using current–time curves at constant potentials. The functioning of the sensor for gas ammonia in propylene carbonate solvent using Pt black and platinum iridium powder mixture as electrodes was appropriate. An amperometric detection system, which is sensitive to the presence of ammonia, was developed in non-aqueous solutions. © 2007 Elsevier B.V. All rights reserved. Keywords: Ammonia; Platinum black; Propylene carbonate; Sensor device