WWRC 89-11
Comparison of Methods for Enumeration of Selected Coliforms Exposed to Ozone
Abstract
mT7 medium performed no better than m-Endo medium in enumerating cells of Escherichia coli and
Citrobacter freundii exposed to ozone. Also. there was no difference in the plate count of heterotrophic bacteria
in ozonated raw water determined on modified Henrici agar or R2A agar. Statistically significant differences
were seen between bacteria and the type of water in which they were suspended during ozonation.
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