Immediately invert Every vial 10 moments when Keeping the vial via the cap only because the vial might be hot from the response induced when introducing the sample.
Chemical oxygen demand refers back to the number of oxygen required for the chemical oxidation of organic and inorganic factors current in wastewater with oxidising agents such as potassium permanganate, potassium dichromate, and many others.
Be certain that the reagent blank vial is the same whole lot selection because the test vials. Be aware: A minimum of a person reagent blank need to be run with Each individual set of samples with each new great deal variety of COD test vials.
Of course. Even though COD should be considered an unbiased test from BOD, and may produce a higher focus reading through than BOD for a certain wastewater sample, it is normally approved that COD and BOD share an empirical romance.
BOD could possibly be outlined as the quantity of oxygen used for biochemical oxidation by microorganisms within a device volume of drinking water. The test has been produced for 5 times at 20oC.
Digestion is carried out around the samples having a established degree of the oxidant, sulfuric acid, and heat (one hundred fifty°C). Metal salts tend to be involved to suppress any interferences and to catalyze the digestion. This digestion typically will take two several hours to complete.
From the existence of a robust oxidising agent in an acidic setting, almost check here any natural and organic element will oxidise to carbon dioxide, in accordance with the COD testing method.
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Chloride is the primary interference when testing for COD. Each individual COD vial applied Together with the dichromate approach contains mercuric sulfate that could eradicate chloride interference around the extent specified in the course of action.
COD measurements will also be used to make certain compliance with environmental polices. Several jurisdictions have rules that specify the maximum allowable COD degrees in wastewater that is definitely discharged to your setting.
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