There are many strategies for measuring COD, Each and every with its advantages and drawbacks. The most typical approaches involve the dichromate system, the permanganate process, as well as the shut reflux system.
This can help improve the Total environmental performance of industries and decrease their effect on water means.
The COD test must be deemed an independent evaluate of the natural and organic matter in a very wastewater sample rather then a substitute for that BOD test.
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In the course of the digestion, It is necessary to own excessive oxidant as this assures total oxidation from the sample. Subsequently, it’s essential to figure out the quantity of extra oxidant. The two commonest techniques for this are titration and colorimetry.
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Biochemical Oxygen Demand (BOD5) measures the level of organic subject present in drinking water that has the potential to become decomposed by a microbial consortium in five times.
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COD stands for “Chemical Oxygen Demand” and is particularly a measure of the quantity of oxygen needed to chemically oxidise natural substances in water for instance ammonia or nitrate, in applications for example lakes, rivers or wastewater that have been contaminated by domestic or industrial waste.
Approach Summary – An aliquot in the sample is digested for 2 several hours at 150°C inside the existence of dichromate more info and sulfuric acid. The ensuing Alternative is titrated to a colored endpoint with ferroin indicator or Read more a spectrophotometer at an appropriate wavelength.
Make certain all caps are secured tightly, then invert Every single vial many times. Bear in mind that scorching vials may shatter if dropped or cooled swiftly.
Chemical oxygen demand, or COD, suggests the quantity of oxygen which can be used by processes inside a calculated Remedy. It is often expressed as being the mass of oxygen utilised for each unit of Alternative volume, or milligrammes for every litre (mg/L) in SI units.
Nagel et al. [sixty two] define BOD5 as a evaluate in the organic contamination from the drinking water that can be biologically degraded. It corresponds to the quantity of oxygen present divided involving the procedure's quantity; it is often expressed in milligrams of O2 per liter.