Progress in the Development of Solid‐State Sulfate Detectors for Sulfur Oxides

The purpose of this article is to describe and analyze the performance of four different reference electrodes adapted for use in solid‐state sulfate detectors for sulfur oxides: an electrode in which a calibrated gas circulates, an Ag/Ag + electrode, an oxygen electrode using air as a reference and, finally, a thermal‐decomposition type of electrode using an MSO 4 ‐ MO couple. The article also contains a description of a quartz detector for hot‐gas analysis of SO 2 ‐ SO 3 mixtures and shows how the fact of replacing the platinum at the electrode by a less catalytic metal such as gold can lead to the specific detection of SO 3 in the presence of SO 2 .