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Chemical Oxygen Demand (COD) is outlined as the amount of oxygen equivalents eaten while in the chemical oxidation of organic and natural make a difference by robust oxidant (e.g., potassium dichromate). The COD worth indicates the quantity of oxygen which is required to the oxidation of all organic and natural substances in h2o in mg/l or g/m3.
COD contrasts with biochemical oxygen demand (BOD), which depends on the use of microorganisms to break down the organic substance while in the sample by aerobic respiration about an incubation time period (ordinarily 5 days).
WARNING! Given that O&G adheres to plastic, only glass sample assortment containers may be used to collect O&G samples!
Eliminate the reagent blank by means of, insert the test vial, address with the light defend, and once again press the evaluate essential. The instrument will read the vial and Screen the test result which can be logged manually.
ISO-compliant reagents: Conform to ISO 15705:2002 techniques with respect for their composition. These compositions of such COD vials are much like that of EPA expectations, so In addition they consist of mercury.
When acquiring results, the analyst may make use of a CHEMetrics photometer, or another manufacturers’ spectrophotometer. Ahead of going on, wipe down the reagent blank and test vials until eventually They can be thoroughly clean and dry.
A further challenge is The shortcoming of the normal COD methods to differentiate amongst biologically obtainable and inert organic and natural issue. This may result in overestimation of the level of oxygen expected for biological treatment method processes.
The value of comprehension both equally concentration and loading could be highlighted by evaluating two fictitious industrial plants. Plant A discharges effluent that has a BOD volume of 250 mg/L, though Plant B's discharge is 1000 mg/L into a metropolis's sewer process. Simply checking out the difference in concentration amongst the two vegetation would lead us to think that Plant B contributes a Significantly bigger quantity of organics (four instances just as much) into your sewer.
An prolonged UBOD (supreme chemical oxygen demand test BOD) test that steps oxygen use just after sixty times or maybe more is typically required in wastewater permits.
For additional security, try to look for designs that have an optional defend that addresses the heating block in case of an accident.
COD represents the degree of contamination in h2o bodies resulting from organic subject. It is outlined given that the oxygen measure comparable to the content material of natural and organic make any difference existing in a sample that robust chemical oxidants, potassium permanganate or potassium dichromate, can oxidize.
Determine the particular concentration of the answer click here to be able to compute the chemical oxygen demand by standardising it.
For Guidance on logging COD Investigation outcomes manually or automatically to your memory, see the V2000 operator guide.