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Integrated Sampling and Analysis Methods for Determining NO x Emissions at Electric Utility Plants
Authors:John H Margeson  William J Mitchell  Jack C Suggs  M Rodney Midgett
Institution:Environmental Monitoring Systems Laboratory , U.S. Environmental Prote[cgrave]tion Agency , Research Triangle Park , North Carolina , USA
Abstract:Two integrated sampling and analysis methods for determining NOx emissions in electric utility plants were developed and field tested. The collection systems consist of: a 4.0% potassium permanganate-2.0% sodium hydroxide solution in restricted-orifice impingers, and a 5A° molecular sieve in midget impingers. Sample analysis is accomplished by a colorimetric or ion-chromatographic procedure with the alkaline-permanganate method and by a colorimetric procedure with the molecular sieve method. The alkalinepermanganate method gives excellent agreement with the EPA reference method, Method 7, for NO x measurements. The molecular sieve method shows a significant negative bias relative to Method 7. It is anticipated that the permanganate methods will be proposed as alternates to Method 7, for NO x determinations, under the EPA New Source Performance Standards.
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