Abstract
The oxidation-reduction potential (ORP) of acidic electrolyzed water was reviewed in terms of its possible role as a bactericidal factor. In connection with this, the substance structure and chemical reaction, oxidation and reduction significance and measuring method of ORP, Nernst's equation, Eh-pH relationship, and available chlorine necessary for understanding ORP were outline.
Based on the results obtainable with an arbitrarily-prepared aqueous solution having almost identical physicochemical properties with those of acidic electrolyzed water, the following concluding remarks on the bactericidal activity of the acidic electrolyzed water were obtained. 1) Bactericidal activity is mainly dependent on available chlorine concentration in the form of HClO and Cl2. 2) pH has no direct contribution to bactericidal activity except for its effect on the ratio of HClo and Cl2. .3) ORP has no direct role as a bactericidal activity.
