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Virucidal effect of chlorinated water containing cyanuric acid

Published online by Cambridge University Press:  15 May 2009

T. Yamashita ,
K. Sakae ,
Y. Ishihara ,
S. Isomura  and
H. Inoue
T. Yamashita
Affiliation:
Aichi Prefectural Institute of Public Health, 7–6, Nagare, Tsujimachi, Kita-ku, Nagoya 462, Japan
K. Sakae
Affiliation:
Aichi Prefectural Institute of Public Health, 7–6, Nagare, Tsujimachi, Kita-ku, Nagoya 462, Japan
Y. Ishihara
Affiliation:
Aichi Prefectural Institute of Public Health, 7–6, Nagare, Tsujimachi, Kita-ku, Nagoya 462, Japan
S. Isomura
Affiliation:
Aichi Prefectural Institute of Public Health, 7–6, Nagare, Tsujimachi, Kita-ku, Nagoya 462, Japan
H. Inoue
Affiliation:
Aichi Prefectural Institute of Public Health, 7–6, Nagare, Tsujimachi, Kita-ku, Nagoya 462, Japan
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The inhibitory influence of cyanuric acid on the virucidal effect of chlorine was studied. The time required for 99·9% inactivation of ten enteroviruses and two adenoviruses by 0·5 mg/l free available chlorine at pH 7·0 and 25○C was prolonged approximately 4·8–28·8 times by the addition of 30 mg/l cyanuric acid. Comparative inactivation of poliovirus 1 by free available chlorine with or without cyanuric acid revealed the following. The inactivation rate by 1·5 mg/l free available chlorine with 30 mg/l cyanuric acid or by 0·5 mg/l free available chlorine with 1 mg/1 cyanuric acid was slower than by 0·5 mg/1 free available chlorine alone. Temperature and pH did not affect the inhibitory influence of cyanuric acid on the disinfectant action of chlorine. In the swimming-pool and tap water, cyanuric acid delayed the virucidal effect of chlorine as much as in the ‚clean’ condition of chlorine-buffered distilled water. The available chlorine value should be increased to 1·5 mg/l when cyanuric acid is used in swimming-pool water.

Type
Research Article
Information
Epidemiology & Infection , Volume 101 , Issue 3 , December 1988 , pp. 631 - 639
Copyright
Copyright © Cambridge University Press 1988

References

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