IRIDIUM AND PLATINUM-IRIDIUM ELECTRODES USED POR DETECTION OF AMMONIA GAS

H. D, ZORZAN; B,A.LÓPEZ DE MISHIMA; H. MISHIMA

Porto

Congreso; 45th Annual Meeting International Society Electrochemistry; 1994

International Society Electrochemistry

The detection of a ammonia gas is of major importance in many technological  fields, such as the food industry, industrial processes, medical diagnosis and environment protection.The present study is conducted to enhance the detection of ammonia gas using Ir and Pt-Ir electrodes. The electrode was prepared by a mixture of Pt black and Ir black at different proportions. Potentiodynamic experiments and current-time curves at constant potential were performed in a glass cell. The sensitivity limits and a linearity of response are examined. The mixture pf Pt-Ir 50: 50 shows increases sensitivity to ammonia, higher than platinum black.