USEPA Method 6C

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Sulfur Dioxide Emissions from Stationary Sources (Instrument Analyzer Method) – USEPA Method 6C

USEPA Method 6C is used for the determination of sulfur dioxide (SO₂) concentrations in controlled and uncontrolled emissions from stationary sources.

A gas sample is continuously extracted from a stack, and a portion of the sample is conveyed to an instrumental analyzer for determination of SO₂ gas concentration using an ultraviolet (UV), nondispersive infrared (NDIR), or fluorescenceanalyzer. Performance specifications and test procedures are provided to ensure reliable data.

The analytical range is determined by the instrumental design. For this method, a portion of the analytical range is selected by choosing the span of the monitoring system. The span of the monitoring system is selected such that the pollutant gas concentration equivalent to the emission standard is not less than 30 percent of the span. If at any time during a run the measured gas concentration exceeds the span, the run is considered invalid.

The minimum detectable limit depends on the analytical range, span, and signal-to-noise ratio of the measurement system. For a well designed system, the minimum detectable limit is less than 2 percent of the span.

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Last Update: October 25, 2006