Cyanide can find its way into drinking water through contamination with commercial or industrial wastewater, as ions, complexes, as part of organic compounds or as chlorine cyanide.
The determination is performed photometrically with a cuvette test.
Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
The photometric determination detects a purple polymethine dye, which is the product of a chlorine cyanide compound initially formed through the degradation of pyridine and then through condensation of the resulting dialdehyde with barbituric acid.