In COD formula there is a numerical factor expressed by 8000 however ın some cases I realized that instead of using 8000, they prefer to use 3003. Do you have any idea where 3003 comes from?
The Chemical Oxygen Demand (COD) is a measure of the amount of oxygen required to oxidize the organic and inorganic substances in a water sample. The COD is commonly used as a measure of water quality and as an indicator of the presence of organic pollutants in water.
The formula for Chemical Oxygen Demand is:
COD = (mg/L of oxygen consumed)
The COD test is performed by measuring the amount of oxygen consumed during a specified period of time, usually 2 hours, when a sample of water is subjected to a strong oxidizing agent, such as potassium dichromate. The oxygen consumed is proportional to the amount of organic matter in the water sample, and the COD result is reported in milligrams of oxygen consumed per liter of water (mg/L).
I think you will need to give references or links to where these factors of 8000 and 3003 may be found.
The first COD test using potassium permanganate was developed by Forchamer in 1849. The possibility that microbes consumed a large amount of dissolved oxygen was first proposed by Dupre in 1884. When comparing BOD and COD tests, he made the discovery that oxygen consumed by a solution of permanganate, the COD is higher than the microbial consumption , the BOD, even taking the ultimate L and the combined demand. I suspect the 3000 figure probably referred to the BOD portion of the COD test?
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