The 5-Second Trick For chemical oxygen demand
The 5-Second Trick For chemical oxygen demand
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The “cod” image will flash for 3 seconds, then the sample test end result will seem during the Display screen as element for every million COD. Record the test outcome.
Ensure that the reagent blank vial is the same great deal number as the test vials. Be aware: At least a single reagent blank should be operate with Just about every list of samples with Every single new good deal amount of COD test vials.
WARNING! Because O&G adheres to plastic, only glass sample collection containers can be used to collect O&G samples!
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Each time a drinking water sample is extremely polluted with organic and natural squander, the oxygen demand will exceed the most equilibrium solubility of O2 in h2o. This kind of water sample read more may not comprise any dissolved O2.
Other approaches like thermal biosensors use sensors to monitor COD online at extended-term in water samples. The biosensor measures the amount of warmth generated in the course of the oxidation of natural make any difference.
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Shake the flask vigorously to dissolve the contents, then include 1000 ml of water and Merge comprehensively.
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Chloride is the main interference when testing for COD. Every single COD vial used With all the dichromate process consists of mercuric sulfate that will reduce chloride interference up to the extent laid out in the procedure.
COD Examination will take about two hours to accomplish due to digestion essential, so ensuring that you choose to’ve followed the test approach correctly can save you lots of squandered time. These stage-by-phase Recommendations can help you assure reliable benefits when.
The COD is the amount of oxygen required by equally the inorganic and natural parts in the wastewater sample.