An Unbiased View of COD testing
An Unbiased View of COD testing
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During the existence of sulfuric acid, silver sulphate, and mercury sulphate, potassium dichromate oxidises the organic and natural make any difference contained within the drinking water sample to generate carbon dioxide (CO2) and water (H2O). The level of potassium dichromate utilised is set by comparing the volumes of ferrous ammonium sulphate consumed for the duration of blank and sample titrations.
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The dichromate system is a greatly applied approach for measuring COD. It requires including a identified excess of potassium dichromate to a recognised quantity of sample from the presence of sulfuric acid.
WARNING! Given that O&G adheres to plastic, only glass sample assortment containers can be used to collect O&G samples!
This method is comparatively uncomplicated and presents A fast and correct measure of COD. Nonetheless, it has some drawbacks, including the utilization of harmful chemicals and The lack to differentiate in between biologically offered and inert natural and organic subject.
In the course of the digestion, it's necessary to possess surplus oxidant as this guarantees full oxidation from the sample. Subsequently, it’s imperative that you identify the quantity of surplus oxidant. The two commonest techniques for this are titration and colorimetry.
Digest your samples as well as a reagent blank. (The reagent blank is simply a sample of deionized water that’s dealt with similar to your true samples. You can also reuse the blank for as long as your reagent batch lasts.)
Chemical oxygen demand (COD) is an indirect measurement of the amount of organic and natural issue inside a sample. When executing a COD test, it is possible to measure just about all natural and organic compounds which might be digested by a digestion reagent.
The COD test uses a chemical (potassium dichromate inside a fifty% sulfuric acid Remedy) that “oxidizes” the two organic (predominate) and inorganic substances inside of a wastewater sample, which ends up in an increased COD concentration than BOD concentration for a similar wastewater sample due to the fact only natural compounds are consumed during BOD testing.
This glossary report aims to deliver an in-depth knowledge of Chemical Oxygen Demand, its importance in wastewater treatment, as well as strategies employed for its resolve.
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The quantity of the oxidant eaten is experimentally calculated to determine the equal volume of oxygen essential because of the wastewater for your degradation with the pollutants. Acidified Cr2O7, that is a more robust oxidant than O2, is often employed for this test.
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