To Measure COD of WasteWater Sample by using Open Reflux Method |
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History of COD :KMn04 was used as oxidising agent for many time pb with KMno4 was that different value of COD obtained due to strength change of KMno4. BOD value obtained greater than COD with KMno4 means KMno4 was not oxidizing all the substances. Tthen ceric sulphate potassium loadate and potassium dichromate all tested sespartely and at the end pottassium sichromate was found practical. Pottassium dichromate is used in excess a mount to oxidise all the organic matter, this excess aomunt can be found at the end by using ferrousiion. Method for cod test : 1. open reflux (drawback: end product is hatardious cannot be dischage in open draws)
1. potassium dischromate (oxidation agents) limitaion of COD:
advantange of COD:
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Apparatus
Procedure:
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