EPA Method 7A

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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