Electrolyte, solid, sulfur dioxide detection

Shiokawa, 1985b, J. Electrochan. Soc. 132,2519. Imanaka, N., G. Adachi and J. Shiokawa, 1986a, A solid electrolyte for sulfur dioxide detection, sodium sulfate mixed with rare earth sulfates and silicon dioxide, ACS Symposium on Chemical Sensors -Fundamentals and Applications (American Chemical Society) p. 121. 

Imanaka N., Yamaguchi Y, Adachi G., and Shiokawa J., Sulfur dioxide gas detection with Na2S04-Li2S04-Y2(S04)3-Si02 solid electrolyte by a solid reference electrode method, J. Electrochem. Soc., 134, 725-728, 1987. 

Nitrogen dioxide can also be selectively detected by an electrode with a chalcogenide (Se6oOe28Sbi2) membrane, without interference from nitric oxide, sulfur dioxide, carbon monoxide, methane, and other gases. Another solid-state sensor for NO2 employs an alkaline nitrate electrolyte at a temperature of 800°C. 

In these solid electrolytes, the species migrating in the solid phase are sodium ions and not suliiir oxides. Therefore, by using this chemistry, we can devise an appropriate sensor arrangement. The gas to detect is SO2 and the ionic state of SO2 gas is SO . As Na+ is the mobile cation in the solid electrolyte, sodium sulfate, which is the combination of both Na and SO ", should be formed on the solid electrolyte surface. In the sulfur dioxide gas sensor with those solid electrolytes, sodium sulfate is used to detect SO2 gas. 

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