The 2-Minute Rule for COD testing

COD is the most popular alternate test to BOD for developing the concentration of natural and organic subject in wastewater samples.

In spite of its popular use, usually there are some worries affiliated with COD measurement. One of the primary worries is the usage of dangerous chemicals from the measurement method.

The COD test really should be considered an unbiased measure on the organic make a difference inside of a wastewater sample in lieu of a substitute for your BOD test.

Insert the COD reagent blank into the sample compartment and press the Zero/Test crucial. The “cod” image will flash for roughly 8 seconds.

This technique is pretty basic and gives a quick and accurate measure of COD. Having said that, it has some disadvantages, such as the utilization of harmful chemicals and The lack to differentiate involving biologically readily available and inert organic make any difference.

Colorimetry also would make measurement quick given that all the analyst should do is digest the samples and Enable the instrument do the work. For these motives, colorimetry is the commonest approach to measure COD.

One particular vial is marked as being a “blank,” and 3 or 4 vials are marked with known regular levels. Two vials are then marked for that wastewater sample to create a duplicate run. Notice: If multiple wastewater samples are increasingly being operate, a minimum of 10% of samples are duplicated.

The most crucial distinction between BOD and COD is the fact BOD is the amount of oxygen that is definitely eaten by micro organism while decomposing organic subject under aerobic circumstances Whilst COD is the quantity of oxygen demanded to the chemical oxidation of full organic & inorganic matter in H2O.

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Just about every vial is combined well and placed to the reactor block for read more 2 hours. Just after two hrs, the vials are faraway from the block to the cooling rack for approximately quarter-hour.

This process makes use of living organisms to aid in decreasing organics. Within the aeration basin, bacteria and microorganisms convert biodegradable organic and natural make a difference to carbon dioxide and water. Using this type of conversion, organics are lessened, therefore decreasing oxygen demand.

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Each strategies for COD testing have to have the digestion move, so a heating block for your samples is crucial for making certain precise and repeatable success. For best final results, seek out a heating block that options various temperatures, so you have utility for other tests, for example full phosphorus.

This method is observed productive when the proportions and types of elements in a wastewater remain comparatively continual.