What are the test methods for determining Residual Chlorine and Residual Ozone in water ?

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Kunal .

Check the links. this might helpul to you.

Kunal

https://law.resource.org/pub/us/cfr/ibr/002/apha.method.4500-cio2.1992.html

Saif Uddin

Thanks Kunal

Henrik Rasmus Andersen

You can determine chlorine + ozone with DPD/iodide and then determine ozone without chlorine interference using either DPD/iodide/glycine or indigo trisulfonate. I think the latter is most precise.