Cyanides (as total CN)


  • soluble in water
  • smells like hydrogen cyanide
  • salts and other compounds of hydrogen cyanide

Main sources

  • agriculture (herbicide)
  • metal industry (metal mining, extraction of precious metals from ores)
  • chemical industry (waste water)
  • also occur naturally

Thresholds for the reporting requirement of facilities in accordance with Annex 2 PRTRO

(Ordinance on the Register relating to Pollutant Release and the Transfer of Waste and of Pollutants in Waste Water)

  • Air                -
  • Water          50 kg/year
  • Soil              50 kg/year


  • very toxic, to aquatic organisms as well


  • the extraction of precious metals from ores with cyanides is banned in many countries

Last modification 04.07.2018

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