What is the difference between DPD total and free chlorine chemistry?

Document ID

Document ID CO198

Published Date

Published Date 01/03/2022
 
What is the difference between DPD total and free chlorine chemistry?
 
DPD total and free chlorine chemistry
 
The total DPD reagent contains KI that reacts with chloramines, in turn the chloramine oxidizes the KI to iodine that reacts with the DPD. The free and total DPD reagents also contain different buffers to properly adjust the pH of the sample.

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