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View Actual EPA Method 7 (PDF File)
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