COD is the most well-liked option test to BOD for setting up the focus of natural and organic issue in wastewater samples.
Between 95-one hundred% of all natural and organic materials is usually oxidized by dichromate. After dichromate oxidizes a substance It is converted to the trivalent kind of chromium, which happens to be a uninteresting green color.
If wastewater made up of higher COD stages is discharged into a purely natural entire body of drinking water, the natural contaminants may perhaps take in or respond with dissolved oxygen leading to dangerously minimal levels of oxygen, also known as hypoxia. This affliction can strain or outright destroy aquatic lifetime.
COD is often a critical indicator of drinking water good quality and is also utilized in many different applications, such as the next:
Even though colorimetry demands a spectrophotometer or photometer, it provides convenience given that most makers offer premixed reagents, so all you must do is operate your samples With all the digestion chemicals and minimum Make contact with.
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Chemical oxygen demand (COD) is undoubtedly an oblique measurement of the quantity of natural and organic matter in a very sample. When doing a COD test, you'll be able to evaluate just about all natural and organic compounds that can be digested by a digestion reagent.
Chemical Oxygen Demand (COD) is click here surely an analytical approach which indirectly actions the level of oxygen necessary to oxidize the organic and natural issue inside a water sample. The upper the concentration of natural compounds within the sample, the bigger the COD measurement will be.
The chemical oxygen demand (COD) represents the level of oxygen in milligrams needed to oxidised each of the organic and natural pollutants present in water to carbon dioxide and water. This oxidation may be represented by the final equation demonstrated beneath.
Biochemical oxygen demand (BOD) is the amount of oxygen required because of the microorganisms to break down organic product, whereas chemical oxygen demand (COD) is the quantity of oxygen necessary to break down the natural and organic substance through chemical oxidation.
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To measure COD, the drinking website water sample is put inside of a closed container and subjected to a strong oxidant, like potassium dichromate and sulfuric acid, for the desired period and temperature.
The COD is the amount of oxygen necessary by both the inorganic and natural parts on the wastewater sample.