Impact of EPA Drinking Water Stage 2 Disinfectant and Disinfectant ...
Impact of EPA Drinking Water Stage 2 Disinfectant and Disinfectant ...
Impact of EPA Drinking Water Stage 2 Disinfectant and Disinfectant ...
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38Measurement <strong>of</strong> <strong>Disinfectant</strong>s• Free Residual Chlorine– Red color formation with DPD <strong>and</strong> buffer– Reaction time <strong>of</strong> 3 – 5 sec– According ISO 7393-2 / <strong>EPA</strong> 334.0– Other methods are acceptable (i.e. amperometric principle) aslong as they are calibrated against above mentioned DPDmethod.• Total Chlorine 1– Additional Potassium Iodide (KI) is added to the buffer.– Red color formation with DPD– Reaction time <strong>of</strong> 3-5 sec• Total Chlorine 2– Red color formation with DPD, buffer <strong>and</strong> KI– Reaction time <strong>of</strong> 120 seconds!Disinfection
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