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Chemical oxygen demand is undoubtedly an index of air pollution that measures the effect of pollutants on dissolved oxygen. During the COD test, an oxidant other than O2 is utilized to degrade the pollutants inside the water sample.
BOD and COD correlate with one another in virtually all samples, but BOD is usually decreased than COD because the biochemical breakdown of organics is often not as entire since the chemical strategy.
COD Examination entails the use of a robust oxidizing agent to oxidize the natural compounds during the sample, as well as the eaten oxidizing agent is then calculated to determine the COD value.
Protected the cap onto Just about every COD vial. Make certain to not overtighten the cap because it could injury the closure.
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
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These strategies are utilized to quantify specific analytes in water by making use of a fixed opportunity or scanning the prospective about A variety of values.
All authors contributed towards the research conception and structure. The concept with the posting was by PBH. The literature lookup and the main draft of the manuscript have been prepared by.
The measurement of COD is commonly carried out by introducing a solid oxidising agent, which include potassium dichromate, to the sample below acidic problems and heated for two hrs. The quantity of dichromate remaining supplies an indication of just how much natural matter was existing.
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You will find a correlation concerning COD and BOD, however, it have to be experimentally set up before utilizing 1 parameter to specific another. Commonly COD analysis (that's a considerably faster and much more exact more info approach) is accustomed to estimate BOD using the proven correlation.
Chemical oxygen demand, or COD, suggests the quantity of oxygen which can be used by procedures in a very measured Answer. It is often expressed given that the mass of oxygen utilised for each unit of Alternative volume, or milligrammes for every litre (mg/L) in SI models.
Strategies concentrating on the detection program have not however been completely made, as their only functionality is to produce the final response additional sensitive.