Bactericidal Properties of Chlorsulfamates

by John E. Delaney, Dir. of Envir. Health Res.; Massachusetts Dept. of Public Health, Lawrence Experiment Station, Lawrence, MA,
J. Carrell Morris, Gordon McKay Prof. of Sanitary Chemistry; Harvard Univ., Cambridge, MA,

Serial Information: Journal of the Sanitary Engineering Division, 1972, Vol. 98, Issue 1, Pg. 23-36

Document Type: Journal Paper


The low bactericidal potency of dichlorsulfamate and the apparent nonexistent bactericidal potency of monochlorsulfamate counter-indicate the use of sulfamate ion as a chlorine stabilizer and sulfamic acid as a pH regulator in swimming pool water. The germicidal potency of dichlorsulfamate increases with increasing pH. It is markedly greater than that of monochlorsulfamate and it is markedly less than that of either hypochlorous acid or chloramide. Concentrations of dichlorsulfamate equivalent to 2.0 mg per 1, 4.0 mg per 1, and 8.0 mg per 1 chlorine require 57 min, 36 min, and 24.5 min, respectively, to effect 99% kills of E. coli at pH 7.0 and 20°C. The presence of ammonia in aqueous solution with dichlorsulfamate enhances the germicidal potency of the chlorine originally present in the form of dichlorsulfamate due to the chemical reactivity of dichlorsulfamate as a N-chlorination agent.

Subject Headings: Chlorine | pH | Bacteria | Acids | Recreational facilities | Water management | Health hazards | Ammonia

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