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INACTIVATION OF GERBIL-CULTURED GIARDIA LAMBLIA CYSTS BY FREE CHLORINE
Citation:
Rubin, A., D. Evers, C. Eyman, AND E. Jarroll. INACTIVATION OF GERBIL-CULTURED GIARDIA LAMBLIA CYSTS BY FREE CHLORINE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/420.
Description:
Giardia lamblia cysts were harvested from Mongolian gerbils and exposed to free chlorine in buffered water at pH 5, 7, and 9 at 15 degrees C. he contact times required to obtained a 2-log reduction in cyst survival (i.e., a 99% kill) were interpolated from survival curves generated at fixed concentrations of chlorine in the range of 0.25 to about 16 mg/liter. oncentration-time (Ct') products for 99% inactivation ranged for about 120 to nearly 1,500 mg min/liter. hese values are higher than those reported previously for free chlorine using G. lamblia cysts from infected humans. he cysts isolated from gerbils, as with other Giardia cysts, were unusually sensitive to chlorine in alkaline solutions.