COD testing Fundamentals Explained

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This can help Enhance the Over-all environmental general performance of industries and reduce their impact on h2o resources.

Chemical oxygen demand (COD) is undoubtedly an oblique measurement of the level of organic subject inside of a sample. With testing COD, you are able to evaluate nearly all organic and natural compounds that can be digested by a digestion reagent.

BOD and COD are vital in wastewater for deciding the quantity of waste within the drinking water. Squander that is significant in natural matter necessitates treatment method to scale back the amount of organic squander in advance of discharging into getting waters.

This process is comparatively simple and presents a quick and exact measure of COD. On the other hand, it's got some shortcomings, such as the utilization of hazardous chemicals and The lack to differentiate amongst biologically obtainable and inert natural and organic matter.

It is actually inaccurate and it has a small limit of detection. Thus, it is inapplicable to river samples that happen to be thoroughly clean and uncontaminated.

Digestion is performed by refluxing (150 °C). The excess of dichromate can be determined by titration or spectrophotometry, and applying mercury salts to eliminate the interference because of chlorine is required. Dichromate is considered as the most effective oxidizing agent along with the prepared Answer is secure for many years, the major problem that get more info shows will be the era of hugely toxic squander [twelve, 59].

The leading difference between BOD and COD is always that BOD is the quantity of oxygen that may be eaten by micro organism even though decomposing natural make a difference beneath aerobic ailments While COD is the quantity of oxygen required for that chemical oxidation of overall natural & inorganic make any difference in H2O.

The drinking water sample is boiled with potassium dichromate inside a strongly acidic medium less than reflux. The organic and natural compounds present within the sample are oxidized by the dichromate.

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pH Measurement: pH measurement is an important software of your electrochemical principle. pH electrodes, frequently known as glass electrodes, are delicate to modifications in hydrogen ion concentration in drinking water.

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The dichromate process is definitely the most generally used and consists of introducing a known excessive of potassium dichromate to the recognised quantity of sample while in the presence of sulfuric acid.

The COD test can be used to determine the strength of wastes which can be far too toxic to become tested via making use of BOD test.