The Single Best Strategy To Use For chemical oxygen demand
The Single Best Strategy To Use For chemical oxygen demand
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Get ready the reagent blank by eliminating the COD vial cap and pipetting deionized h2o in lieu of sample in to the vial.
On the other hand, it's important to note that the correlation may not be perfect due to the presence of inorganic carbon compounds, non-oxidizable natural and organic compounds, and variations from the composition of natural pollutants.
Ensure that the reagent blank vial is similar large amount quantity given that the test vials. Notice: At the very least just one reagent blank has to be operate with Every single list of samples with Just about every new ton range of COD test vials.
Chemical Oxygen Demand can be a essential metric within the wastewater market and is typically claimed as milligrams of oxygen eaten for each liter of sample (mg/L COD).
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A person vial is marked as being a “blank,” and three or 4 vials are marked with identified typical concentrations. Two vials are then marked for the wastewater sample to generate a duplicate operate. Take note: If numerous wastewater samples are being operate, at the least 10% COD testing of samples are duplicated.
In the event the wastewater sample is tested at whole toughness, then 2 ml is extra on the corresponding vial. If dilution is needed, then serial dilutions are done and a pair of ml with the diluted sample are extra on the corresponding vial.
The COD test takes advantage get more info of a chemical (potassium dichromate within a 50% sulfuric acid Remedy) that “oxidizes” both of those natural (predominate) and inorganic substances inside a wastewater sample, which leads to an increased COD focus than BOD focus for a similar wastewater sample given that only organic compounds are consumed during BOD testing.
Monitoring COD aids in optimizing treatment method functions and making certain compliance with regulatory specifications.
Check with CHEMetrics COD analysis Directions for assortment-certain calibration equations to convert absorbance values to test outcomes as element per million COD.
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Both techniques for COD testing call for the digestion action, so a heating block on your samples is essential for making certain correct and repeatable benefits. For most effective results, search for a heating block that functions a number of temperatures, so you might have utility for other tests, for instance total phosphorus.
For Guidance on logging COD Examination results manually or mechanically for the memory, begin to see the V2000 operator manual.