EPA Method 7
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EPA Method 7:
DETERMINATION OF NITROGEN OXIDE EMISSIONS FROM STATIONARY SOURCES.
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.
This method is applicable for the measurement of nitrogen oxides (NOx) emitted from stationary sources.
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