EXPERIMENTAL OBSERVATION ON GERMICIDAL EFFICACY AND CORROSIVENESS OF BROMOCHLOROHYDANTOIN DISINFECTION POWDER

In order to know the germicidal efficacy of the bromochlorohydantoin disinfection powder and its corrosiveness to metals,suspension quantitative germicidal test and metal corrosion test were carried out.The results showed that the reduction log factor of Escherichia coli in suspension exposed to the solution containing available halogen(calculated according to the available chlorine) 50 mg/L for 3 min,Staphylococcus aureus in suspension exposed to the solution containing available halogen(calculated according to the available chlorine) 75 mg/L for 3 min,Candida albicans in suspension exposed to the solution containing available halogen(calculated according to the available chlorine) 600 mg/L for 5 min and Bacillus subtilis var.niger spores in suspension exposed to the solution containing available halogen(calculated according to the available chlorine) 1200 mg/L for 120 min were 5.00.After immersing in the solution containing available halogen(calculated according to the available chlorine) 1200 mg/L for 72 h,there were no corrosion of stainless steel coupon,moderate corrosion of aluminum coupon and copper coupon and severe corrosion of carbon steel coupon.The results indicated that this bromochlorohydantoin disinfection powder has good germicidal efficacy and stability,but is corrosive to metals.