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A further effective method for COD removing may be the addition of bacteria or other microbes that degrade organic and natural components in wastewater.
Once all the excess dichromate reacts, an equivalence stage is achieved. This stage implies that the quantity of ferrous ammonium sulfate you additional is equivalent to the quantity of excess dichromate.
Insert the COD reagent blank into your sample compartment and push the Zero/Test critical. The “cod” image will flash for approximately eight seconds.
Do có nồng độ cao trong phần lớn các loại nước thải nên chloride thông thường là nguồn quan trọng nhất trong việc gây nhiễu. Phản ứng của nó với dicromat kali như sau:
Colorimetry also tends to make measurement effortless considering that the many analyst should do is digest the samples and Enable the instrument do the function. For these factors, colorimetry is the commonest process to evaluate COD.
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Most heating blocks also have timers, which might be significant for maintaining digestion situations consistent over multiple operates.
Following dilution, the ensuing difference between the Original and remaining DO studying basically should be multiplied by the dilution component to ascertain the final BOD outcome.
The chemical oxygen demand (COD) signifies the quantity of oxygen in milligrams needed to oxidised many of the organic pollutants present in h2o to carbon dioxide and drinking water. This oxidation might be represented by the final equation proven under.
COD describes the amount of oxygen needed to chemically stop working pollutants, though BOD implies the level of oxygen necessary to stop working organic and natural pollutants biologically with microorganisms.
There are several standardized approaches for measuring COD, but the most common may be the dichromate reactor digestion method which consists of the response of sample with potassium dichromate inside read more a sulfuric acid Remedy.
Chemical oxygen demand, or COD, indicates the quantity of oxygen that could be utilized by processes in a measured Remedy. It is frequently expressed as being the mass of oxygen utilised for each device of Option volume, or milligrammes for every litre (mg/L) in SI units.
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