Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Radiolysis of Hydrogen Cyanide in an Aqueous System. II. Effects of Additives and Reaction Mechanism
Hajime Ogura
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1968 Volume 41 Issue 12 Pages 2871-2876


The 60Co γ-irradiation of dilute aqueous solutions of hydrogen cyanide (6 mM) in the absence of oxygen yielded mainly ammonia with G=1.9, formaldehyde with G=1.1, and carbon dioxide with G=0.8, while G(–HCN)=5.8 molecules per 100 eV. Polymeric hydrogen cyanide was also observed with the G(–HCN(polymer))\simeq4, which showed an intense broad absorption band in the UV region upon γ-irradiation. The following material balances were observed with the main products:
The results can be interpreted in terms of a mechanism involving HCN, H2CN, and H(OH)CN radicals. The ratio of the rate constants for the reactions of eaq and H atoms with hydrogen cyanide to those with several scavengers have been determined as k(eaq + HCN)/k(eaq + NO3)=0.019 and k(H + HCN)/k(H + 2-propanol)=1.4, all at 17°C.

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