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Monitoring Mortality of Pythium Zoospores in Chlorinated Water Using Oxidation Reduction Potential

J. M. Lang, B. Rebits, S. E. Newman, and N. Tisserat

September 2008


Pythium species in recycled irrigation water may cause damping off and root rot. Disinfecting chlorination can be difficult to monitor accurately because its activity is pH-dependent. ORP is a good measure of the oxidizing potential of a chlorine solution. The authors used ORP to measure the disinfestant potential of chlorine treatments against P. aphanidermatum and P. dissotocum zoospores. Since ORP is inversely related to pH at a given chlorine level, the water pH was lowered to observe ORP and zoospore mortality.


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