peroxide drogen peroxide peroxide______________________________________number of bacteria 6 1 u00d7 10 sup 2 less than 1 u00d7 10 sup 1 6 4 u00d7 10 sup 2in water cfu ml number of bacteria 1 3 u00d7 10 sup 6 1 0 u00d7 10 sup 2 1 8 u00d7 10 sup 6on surface of coppertube cfu cm sup 2 rest potential 160 100 80of copper tube mv ag agcl ______________________________________ table 4______________________________________concentration of h sub 2 o sub 2 10 mg l added as sodiumperoxocarbonate before add after 2 hr after 24 hr from ing hydrogen from adding hy adding hydrogenexample 4 peroxide drogen peroxide peroxide______________________________________number of bacteria 2 0 u00d7 10 sup 3 less than 1 u00d7 10 sup 1 5 4 u00d7 10 sup 3in water cfu ml number of bacteria 5 4 u00d7 10 sup 5 8 2 u00d7 10 sup 3 2 3 u00d7 10 sup 4on surface of coppertube cfu cm sup 2 rest potential 150 140 60of copper tube mv ag agcl ______________________________________ table 5______________________________________concentration of h sub 2 o sub 2 10 mg l added as hydrogen peroxide before add after 2 hr after 24 hr from ing hydrogen from adding hy adding hydrogenexample 5 peroxide drogen peroxide peroxide______________________________________number of bacteria 1 6 u00d7 10 sup 3 1 8 u00d7 10 sup 2 2 2 u00d7 10 sup 2in water cfu ml number of bacteria 3 2 u00d7 10 sup 5 6 4 u00d7 10 sup 3 1 2 u00d7 10 sup 5on surface of coppertube.