表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
ISSN-L : 0915-1869
研究論文
Effect of pH on the Efficacy of Sodium Hypochlorite Solution as Cleaning and Bactericidal Agents
Satoshi FUKUZAKIHiromi URANOSadako YAMADA
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2007 年 58 巻 8 号 p. 465

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The efficacy of sodium hypochlorite (NaOCl) solution as a cleaning and bactericidal agent against Pseudomonas fluorescens was studied as a function of pH. Alumina (Al2O3) particles on which P. fluorescens cells were irreversibly adhered were cleaned with NaOCl solutions of pH 5 to 12 containing free available chlorine (AC) of 120 to 1000mg/L. The efficiency of the removal of P. fluorescens cells from the Al2O3 surfaces increased with increasing pH and the AC concentration. It was found that the efficacy of NaOCl solution as a cleaning agent depended on the concentration of the dissociated hypochlorite ion (-OCl). On the other hand, the bactericidal activity of NaOCl solution of 2.5mg AC/L increased with decreasing pHs from 9.3 to 5.7. The logarithmic relative reductions of viable P. fluorescens were proportional to the product of the AC concentration and time, and the rate of inactivation depended on the concentration of undissociated hypochlorous acid (HOCl). Our results show that the cleaning and bactericidal activities of NaOCl solution are governed by the percentage of HOCl and -OCl existing in the solution.

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© 2007 by The Surface Finishing Society of Japan
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