EPA Method 7

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EPA Method 7:
DETERMINATION OF NITROGEN OXIDE EMISSIONS FROM STATIONARY SOURCES.

Summary:
A grab sample is collected in an evacuated flask containing a dilute sulfuric acid-hydrogen peroxide absorbing solution, and the nitrogen oxides, except nitrous oxide, are measured colorimetrically using the phenoldisulfonic acid (PDS) procedure.

Scope:
This method is applicable for the measurement of nitrogen oxides (NOx) emitted from stationary sources.

Date Issued:
3/12/1996