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View Actual EPA Method 7B (PDF File)
EPA Method 7B:DETERMINATION OF NITROGEN OXIDE EMISSIONS FROM STATIONARY SOURCES (ULTRAVIOLET SPECTROPHOTOMETRIC METHOD)
Summary:A grab sample is collected in an evacuated flask containing a dilute sulfuric acid-hydrogen peroxide absorbing solution; the NOx, excluding nitrous oxide (N2O), are measured by ultraviolet spectrophotometry.
Scope:This method is applicable for the determination of NOx emissions from nitric acid plants.
Date Issued:8/20/1996