An official website of the United States government.

SW-846 Test Method 9213: Potentiometric Determination of Cyanide in Aqueous Samples and Distillates with Ion-Selective Electrode

The following document discusses the method for measuring free (non-complexed) cyanide and hydrocyanic acid in drinking waters, natural surface waters, domestic and industrial wastewaters, and in soil extracts.

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