COD analysis with photometer, Hanna photometer, cod analysis procedure.

Dear Friends, Here we are sharing COD analysis procedure with photometer, please watch this video and subscriber this channel.
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[@tarunsharma-xd4jh]

Shandar presentation

[@tarunsharma-xd4jh]

Nice sirji

[@angelneha9651]

👍👍

[@ramimohii]

I want that paper which have the manual analysis

[@AbhishekYadav-gi4ff]

Bod