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Effect of Sodium Bromide on the Bactericidal Effectiveness of Hypochlorite Sanitizers of High Alkalinity¹

Department of Dairy Technology, The Ohio State University, Columbus

ABSTRACT

Studies were conducted, in which comparisons were made of a standard hypochlorite sanitizer of high alkalinity (pH 11 at 100 p.p.m.) and the same sanitizer to which was added crystalline NaBr·2H₂O. Addition of the NaBr·2H₂O improved the germicidal effectiveness of the hypochlorite sanitizer under laboratory conditions. The rate of increase in effectiveness varied with the concentration of NaBr·2H₂O and the test organism. A standard mixture of 1.35% NaBr·2H₂0 and the sanitizer resulted in a 33 to 1,000% increase in bactericidal effectiveness against a variety of bacteria, in comparison to results obtained by using the sanitizer alone. Mixtures of 4% of NaBr·2H₂O and the alkaline sanitizer compared favorably in germicidal effectiveness against all test organisms to a hypochlorite sanitizer of relatively low alkalinity.

Variations in temperature and addition of 0.5% skimmilk and hard water affected the bromide-hypochlorite mixture in ways similar to those in which other hypochlorite-type sanitizers were affected. However, under these conditions, the mixture was usually superior in germicidal effectiveness to the alkaline sanitizer alone. The corrosiveness of the sanitizer was not affected by addition of 1.35% NaBr·2H₂O.

¹ Article No. 14: 57 of the Department of Dairy Technology, The Ohio State University. Supported by a grant from the Diversey Corporation, Chicago, Illinois, administered by the Ohio State University Research Foundation.