A comparison of a quaternary ammonium compound and a calcium hypochlorite compound as a germicidal agent

Abstract

A calcium hypochlorite compound, used at a concentration of about 50 p.p.m. available chlorine, and a di-isobutyl cresoxy ethoxy ethyl di-methyl benzyl ammonium compound, used at 200 p.p.m., were tested by the Weber-Black method with a laboratory strain of Escherichia coli as the test organism. The hypochlorite showed the greater efficiency, probably because of the lower resistance of the gram-negative test organism.