A Solid‐State Probe for SO 2 / SO 3 Based on Na2 SO 4 ‐ I Electrolyte

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Abstract
Conductivity measurements as a function of temperature and partial pressures of , , and , and transference experiments indicate that the transport number of Na+ ions is unity in . A concentration cell based on this electrolyte produces emf's that are in agreement with those calculated from the Nernst equation when equilibrium is assumed between the gas species at the electrodes. The cell can be used for monitoring the pollution in air, and in combination with an oxygen probe can be used for the determination of concentrations in coal combustion reactors, for the evaluation of the partial pressure of in coal gasification systems, and for emission control in nonferrous smelters using sulfide ores. The probe is similar to that developed recently by Gauthier et al. (4, 5) using as the electrolyte, but can operate at higher pressures of . Because of the greater polarizing power of the Na+ ion compared to the K+ ion, is less stable and can be formed only at a considerably higher pressure of than that required for .

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