Abstract
The bactericidal effects of solutions of sodium chlorite (NaClO2) at various pH values was studied by several methods (the phenol coefficient method, available chlorine germicidal equivalent concentration method and phenol coefficient method under dirty conditions).A 2.73% NaClO2 solution at pH 8.8-9.1 showed no bactericidal effect against E. coli and S. aureus within 15min, but it destroyed them within 2.5min when the pH value was adjusted to 4.0. The bactericidal effect of the solution was increased by elevating the acidity of the solution, and the NaClO2 solution at the lowest concentration adjusted to pH 2.0, had a bactericidal effect. Even at pH 4.0, the effect of the high-concentration solution was sufficient.The bactericidal effect of NaClO2 at pH 4.0 was independent of the use of lactic acid, acetic acid or hydrochloric acid for pH adjustment. However at pH 2.0, the organic acids were superior to the inorganic acid as the pH regulator.
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