USEPA Method 7E

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Nitrogen Oxide Emissions from Stationary Sources (Instrument Analyzer Procedure) – USEPA Method 7E

USEPA Method 7E is used to determine nitrogen oxide (NOx) concentrations in emissions from stationary sources.

A sample is continuously extracted from the effluent stream; a portion of the sample stream is conveyed to an instrumental chemiluminescent analyzer for determination of NOx concentration. 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