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View Actual EPA Method 7A (PDF File)
EPA Method 7A:DETERMINATION OF NITROGEN OXIDE EMISSIONS FROM STATIONARY SOURCES (ION CHROMATOGRAPHIC METHOD)
Summary:A grab sample is collected in an evacuated flask containing a dilute sulfuric acid-hydrogen peroxide absorbing solution. The nitrogen oxides, excluding nitrous oxide (N2O), are oxidized to nitrate and measured by ion chromatography.
Scope:This method is applicable for the determination of NOx emissions from stationary sources.
Date Issued:1/28/1991