The Greatest Guide To chemical oxygen demand

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This oxidation is catalyzed by silver sulfate. The catalyst is necessary, especially to oxidize minimal molecular body weight fatty acids. The oxidation by the acidified dichromate may be represented by the subsequent equation:

BOD and COD correlate with one another in almost all samples, but BOD is often reduced than COD because the biochemical breakdown of organics is usually not as complete given that the chemical method.

Insert the COD reagent blank into the sample compartment and push the Zero/Test key. The “cod” image will flash for about 8 seconds.

While colorimetry needs a spectrophotometer or photometer, it provides usefulness due to the fact most manufacturers offer premixed reagents, so all you must do is operate your samples While using the digestion chemicals and minimal Get hold of.

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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 Historically, potassium permanganate stuffed this job, but it absolutely was found to become inconsistent in its capability to oxidize many of the natural and organic matter in numerous types of waste samples.

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It entails the oxidation of natural and organic and inorganic carbon compounds click here existing in the h2o sample at large temperatures.

Pipet two milliliters of sample into Every vial. Bear in mind that adding the sample will cause an exothermic reaction and also the vial will develop into scorching.

It might be outlined as the level of oxygen necessary by organic and natural issue in a very sample of drinking water for its oxidation by a robust oxidizing agent and is particularly expressed as ppm of oxygen taken from a solution of K2Cr2O7 in two sorts.

When COD is existing, the chemical oxidation of natural make a difference is accelerated with no need for added machines.