2015 Volume 6 Issue 3 Pages 181-188
Acid bypochlous aqueous solution by electrolyzing a sodium chloride aqueous solution has a bactericidal effect. As bromic acid is the same type of halos salt as the sodium chloride, it is supposed that bromic acid aqueous solution by electrolyzing sodium bromide aqueous solution would also have a bactericidal effect, and its bactericidal effect would be higher than hypochlorous acid. In this study, electrolyzed water including bromic acid was produced by electrolysis reaction of sodium bromide solution in 3 rooms - 2 membranes electrolysis tank. Then, the relationship of bromic acid concentration and coulomb was indicated, and the bactericidal effect of electrolyzed water including bromic acid was examined. It showed that the concentration of bromic acid in electrolyzed water increase in proportion to coulomb. And sodium ionic transferences number from middle tank into cathodic tank was larger than bromic ionic transport number from the middle tank into the anodic tank. This indicated that there was a difference in the content of ions to carry electric charges. To compensate this difference in the content of ions, hydrogen ions and hydroxide ions were produced by electrolyzing water molecules near anion exchange membrane on the anode electrode, hydroxide ions would compensate the difference in the content of ions. As hydrogen ions transported in into the middle tank by passing through the membrane, the pH of bromic sodium solution in the middle tank indicated acidic. Bactericidal effect of hypochlorous acid and bromic acid was examined as a target E.coli, S.Aureus, P.aeruginosa,and B.subtilis. From the results of a bactericidal effect, it showed that even the lower substrate concentration of bromic acid than that of hypochlorous has a bactericidal effect. And also much lower substrate concentration of electrolyzing a sodium bromide aqueous solution by long- term storage possibly has sufficient bactericidal effect. This sufficient bactericidal effect would depend on the high hydrogen ion concentration in electrolyzed water.
