A galvanic sensor for SO 3 /SO 2 based on the CaF 2 /CaSO 4 couple
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Measurements on the solid state cell, Pt/O' 2 + SO' 2 + SO' 3 /CaF 2 + CaSO 4 ||CaF 2 ||CaF 2 + CaSO 4 /O" 2 + SO" 2 + SO" 3 /Pt using single crystal CaF 2 as the solid electrolyte and CaSO 4 as an auxiliary electrode, indicate that the EMF is in agreement with that predicted by the Nernst equation when equilibrium is assumed in the gas phase near the electrodes. The cell can be used to measure the SO 2 /SO 3 content of gases at temperatures near 1200 K, where approximately 2 h ate required to obtain a steady EMF, without the use of catalysts to improve the kinetics of exchange reaction in the auxiliary electrode. For most applications, the cell EMF will be affected by the presence of water vapour in the gas phase. The cell is well suited for thermodynamic measurements on sulfates, pyrosulfates and their solid and liquid solutions.