|
Effect of pH on Hypobromous and Hypochlorous Acid Concentrations |
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|
pH |
%HOCl |
%HOBr |
|
6 |
97 |
100 |
|
7 |
78 |
98 |
|
8 |
26 |
83 |
|
9 |
3 |
33 |
Although hypobromous acid has nearly the same microbiocidal properties as hypochlorous acid, ．bromine・ is more effective than ．chlorine・ in the pH range of 7.5 to 9 because of hypobromous acid・s higher pK value (8.7). As shown in the above table, the hypobromous acid concentration will be higher than hypochlorous acid at any given pH.
Prof
K.S. CHAN,