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 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 This website is no longer updated and links to external websites and some internal pages may not work.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 »

SW-846 Test Method 4025: Screening for Polychlorinated Dibenzodioxins and Polychlorinated Dibenzofurans (PCDD/PCDFs) by Immunoassay

This method is a procedure for the analysis of polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in soil at 500 parts per trillion (picograms per gram) using a simple one-step liquid phase oxidative cleanup or, at mid to low ppt levels, using a two step coupled column cleanup (oxidation and activated carbon binding) adapted from Method 8290.

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