An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Air Emission Measurement Center (EMC)

Method 7D - Nitrogen Oxide - Ion Chromatography

Do you have questions about a Test Method, Performance Specification or Source Category? Find the EMC contact for your question in the EMC Directory.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.

Method 7D Determination of nitrogen oxide emissions from stationary sources - Alkaline-permanganate/ion chromatographic method 8-3-2017 (PDF)(7 pp, 314 K)
CFR Promulgated Test Method 7D Determination of nitrogen oxide emissions from stationary sources - Alkaline-permanganate/ion chromatographic method