The COD testing Diaries
The COD testing Diaries
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Straight away invert Each and every vial 10 periods even though holding the vial via the cap only as the vial will likely be hot from your response brought on when adding the sample.
The permanganate approach is analogous but employs potassium permanganate instead of potassium dichromate. The closed reflux strategy includes heating the sample beneath reflux situations, which raises the level with the response and permits a shorter test period.
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Chemical Oxygen Demand is usually a key metric during the wastewater industry and is often reported as milligrams of oxygen eaten per liter of sample (mg/L COD).
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C O D = 8000 ( b − s ) n T h e t i c h m a u t h u displaystyle COD= frac 8000(b-s)n The tich mau thu
The COD test is greatly utilised as a way of measuring pollutants effecting aquatic ecosystems. Not like the Biochemical Oxygen Demand (BOD) test, which only actions the level of oxygen consumed by microbial oxidation, the COD test steps the oxygen eaten read more by chemical oxidation.
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The crucial place is that after getting set up a mean COD:BOD ratio in your wastewater stream, then the fairly basic and fast COD test may be used to predict BOD with relative reliability.
Common strategy scaling utilizes precisely the same extremely toxic reagents; However, a diminishing of volumes of reagent desired as well as processing time of standardized technique enable minimizing the impact of squander generation. Also, prices are reduced although obtaining statistically similar final results.
Chloride is the main interference when testing for COD. Every COD vial made use of While using the dichromate strategy consists of mercuric sulfate that should remove chloride interference as much as the extent specified in the procedure.
Chemical oxygen demand, or COD, implies the level of oxygen that could be used by procedures in a measured Alternative. It is usually expressed as being the mass of oxygen utilised for every device of solution quantity, or milligrammes for every litre (mg/L) in SI models.
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