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Determination
of Nitrogen Oxide Emissions from Stationary Sources – USEPA
Method 7 USEPA Method 7 is used to measure nitrogen oxides (NOx) emitted 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. Biased results are observed with this method when sampling under conditions of high sulfur dioxide concentrations (above 2000 ppm). |
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