Conference proceeding
Further Studies of Hypochlorite Ion Pair Chemistry and Disinfection Efficiency
Water Chlorination: Chemistry, Environmental Impact and Health Effects. Volume 6. Proceedings of the Sixth Conference on Water Chlorination: Environmental Impact and Health Effects, Vol.6, pp.729-740
01 May 1989
Abstract
Previous studies have shown that lithium, sodium and potassium cations can form ion pairs with hypochlorite that are titratable potentiometrically, and that enhance the disinfection efficiency of free chlorine to coliforms. A report on investigations that were conducted to measure the ion pair formation using a different experimental methodology and to determine whether enhancement of biocidal efficiency by ion pairs would also occur when ammonia was present, (thus resulting in a stable combined residual) is presented. The effect of ionic environment on the spectrophotometric absorbance of hypochlorite anion was used to study the chemistry of ion pairing. Escherichia coli was used in the disinfection microbiology studies. Results indicate that the alkali cations (lithium, sodium, and potassium) produce measureable changes in the physical- chemical properties of hypochlorite consistent with the formation of a 1: 1 ion pair with the hypochlorite anion. The dissociation constants measured spectrophotometrically are somewhat greater than those previously obtained from titration. Data obtained in this work suggest that the ion-pairing phenomenon may also influence the reaction rate with ammonia, and that there may be some nonadditivity of the inactivation rates of free chlorine and monochloramine during dynamic chlorination. (See also W91-00476) (Lantz-PTT)
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Details
- Title
- Further Studies of Hypochlorite Ion Pair Chemistry and Disinfection Efficiency
- Creators
- J O'DonnellC TrivediC Haas
- Publication Details
- Water Chlorination: Chemistry, Environmental Impact and Health Effects. Volume 6. Proceedings of the Sixth Conference on Water Chlorination: Environmental Impact and Health Effects, Vol.6, pp.729-740
- Conference
- Water Chlorination: Chemistry, Environmental Impact and Health Effects. Sixth Conference on Water Chlorination: Environmental Impact and Health Effects, 6th (Oak Ridge, Tennessee, United States, 03 May 1987 - 08 May 1987)
- Number of pages
- 1
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Identifiers
- 991019189168604721