Citation:

Korich, D., J. Mead, M. Madore, N. Sinclair, AND C. Sterling. EFFECTS OF OZONE, CHLORINE DIOXIDE, CHLORINE, AND MONOCHLORAMINE ON CRYPTOSPORIDIUM PARVUM OOCYST VIABILITY. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/278 (NTIS PB91145086).

Description:

Purified Cryptosporidium parvum oocysts were exposed to ozone, chlorine dioxide, chlorine, and monochloramine. xcystation and mouse infectivity were comparatively evaluated to assess oocyst viability. zone and chlorine dioxide more effectively inactivated oocysts than chlorine and monochloramine did. reater than 90% inactivation as measured by infectivity was achieved by treating oocysts with 1 ppm of ozone (1 mg/liter) for 5 min. xposure to 1.3 ppm of chlorine dioxide yielded 90% inactivation after 1 h, while 80 ppm of chlorine and 80 ppm of monochloramine required approximately 90 min. for 90% inactivation. he data indicate that oocysts are 30 times more resistant to ozone and 14 times more resistant to chlorine dioxide than Giardia cysts exposed to these disinfectants under the same conditions. ith the possible exception of ozone, the use of disinfectants alone should not be expected to inactivate C. parvum oocysts in drinking water.

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