Abstract
Our laboratory has been using a Thermo Electron Model 40 Pulsed Fluorescence SO/sub 2/ Monitor, Serial Number 40-19670-185, without sample conditioner to measure sulfur dioxide in synthetic flue gases. The flue gases are generated by mixing pure (greater than 99.98 percent purity) sulfur dioxide, air, nitrogen and carbon dioxide with a rotameter gas dilution system. By knowing the flow rates of the gases, the concentration of sulfur dioxide in the flue gas can be calculated. By performing an error analysis, this system should be able to generate a sulfur dioxide concentration within 2 percent. A typical calibration curve for this instrument shows a maximum difference between the calculated concentration and the measured concentration of approximately 5.0 percent. With the addition of water, the signal corresponding to sulfur dioxide changed significantly. The sulfur dioxide concentration was approximately 1200 ppm. Figure 1 shows an average error approximately 35 percent occurs for water concentrations greater than 2 mole percent. This results indicates extreme care should be used when using pulsed fluorescence without a conditioner to measure sulfur dioxide in the presence of water. The exact mechanism of this interference is undetermined at this time.
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