The hydroxide-assisted hydrolysis of cyanogen chloride in aqueous solution

Erik J. Pedersen, Benito J. Mariñas

Research output: Contribution to journalArticlepeer-review


The hydrolysis of cyanogen chloride (ClCN) was studied as a function of temperature and pH. Results were used to resolve discrepancies among previously reported kinetic constants. The pH dependence was studied over a range of 9.54-10.93 at a temperature of 21.0 °C. The effect of temperature was investigated over the range of 10-30 °C at a pH of approximately 10. Changes in the concentrations of ClCN and the reaction products cyanic acid and chloride ion were monitored with time. For the conditions corresponding to these experiments, the hydroxide-assisted hydrolysis pathway predominated. Collision frequency factor and activation energies recommended to represent the hydrolysis of ClCN in aqueous solution are A = 2.06×1011 M-1 s-1 and Ea = 60,980 J mol-1 for the hydroxide-ion-assisted reaction, and A = 9.97×108 s-1 and Ea = 87,180 J mol-1 for the water-assisted reaction.

Original languageEnglish (US)
Pages (from-to)643-648
Number of pages6
JournalWater Research
Issue number3
StatePublished - Feb 2001
Externally publishedYes


  • Chloride
  • Cyanate
  • Cyanic acid
  • Cyanogen chloride
  • Disinfection by-product
  • Hydrolysis
  • Kinetics
  • PH effect
  • Reaction rate
  • Temperature effect

ASJC Scopus subject areas

  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution


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