USEPA Method 8

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Sulfuric Acid and Sulfur Dioxide Emissions from Stationary Sources – USEPA Method 8

USEPA Method 8 is used to measure sulfuric acid (including H₂SO₄ mist and SO₃) and gaseous SO₂ emissions from stationary sources. Source gas is withdrawn isokinetically and bubbled through isopropanol (to collect H₂SO₄ mist and SO₃) followed by a solution of hydrogen peroxide (to collect SO₂). The H₂SO₄/SO₃ and the SO₂ fractions are measured separately by the barium-thorin titration method.

Filterable particulate matter may be determined along with SO₃ and SO₂ (subject to the approval of the Administrator) by inserting a heated glass fiber filter between the probe and isopropanol impinger. If this option is chosen, particulate analysis is done gravimetrically and sulfuric acid is not determined.

Possible interfering agents of USEPA Method 8 include fluorides, free ammonia, and dimethyl aniline. If any of these interfering agents is present (this can be determined by knowledge of the process), alternative methods, subject to the approval of the Administrator, are required.

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Last Update: October 25, 2006