= Cyanide in Waters and Extracts, Method 9014 by United States Environmental Protection Agency
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Institutional analytical method. Cited §§1–4 address scope and interferences; §§8–9 address sample handling and quality control; §11.3 and §12.2 specify silver titration, the 2:1 cyanide-to-silver ratio, indicator and blank. The rhodanine indicator is presented as a modern comparison, not assigned to 1867.
https://www.epa.gov/sites/default/files/2015-12/documents/9014.pdf
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