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Determination
of Sulfur Dioxide Emissions from Stationary Sources – USEPA
Method 6 USEPA Method 6 is used to measure sulfur dioxide (SO2) emissions from stationary sources. Source gas is withdrawn at a constant rate and bubbled through isopropanol (to remove sulfur trioxide) followed by a solution of hydrogen peroxide. The SO2 collected in the hydrogen peroxide is measured by the barium-thorin titration method. Potential bias of the USEPA Method 6 analysis occurs through interference from two sources: free ammonia and water soluble cations and fluorides. Free ammonia interferes by reacting with the SO2 to form particulate sulfite and by reacting with the indicator. If it is present (this can be determined by knowledge of the process and/or noticing white particulate matter in the probe and isopropanol bubbler), alternative methods, subject to the approval of the Administrator, are required. Water-soluble cations and fluorides are removed by a glass wool filter and an isopropanol bubbler; therefore, they do not affect the SO2 analysis. When samples are collected from a gas stream with high concentrations of metallic fumes (i.e., very fine cation aerosols) a high-efficiency glass fiber filter must be used in place of the glass wool plug to remove the cation interferent. |
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Last Update: October 25, 2006