The chemical oxygen demand test Diaries

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The COD test needs to be regarded as an unbiased evaluate on the organic make any difference in a very wastewater sample as opposed to a substitute for your BOD test.

The quantity of potassium dichromate Employed in the reaction is equivalent to the quantity of oxygen (O2) required to oxidise the wastewater’s organic information.

Substantial COD concentrations in wastewater show the presence of organic substances that may decrease the quantity of dissolved oxygen.

Benefit from multipurpose measuring equipment with various measuring solutions in the sphere of non-harmful materials testing. All devices are created for fast and accurate measurement.

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These techniques are accustomed to quantify precise analytes in water by making use of a set possible or scanning the potential about a range of values.

The water sample is boiled with potassium dichromate in a very strongly acidic medium underneath reflux. The natural compounds current within the sample are oxidized because of the dichromate.

The ultimate DO reading is then subtracted from the Preliminary DO looking at and the result may be the BOD focus (mg/L). In case the wastewater sample required dilution, the BOD concentration looking through is multiplied via the dilution variable.

A COD reactor/heating (one hundred fifty°C) block plus a colorimeter are turned on in order that each devices are allowed to stabilize.

Chloride is the first interference when testing for COD. Just about every COD vial made use of Using the dichromate system contains mercuric sulfate that could do here away with chloride interference up to the level specified in the procedure.

Chemical oxygen demand, or COD, indicates the level of oxygen which can be used by procedures in the measured Remedy. It is usually expressed since the mass of oxygen utilised per device of Option volume, or milligrammes for every litre (mg/L) in SI units.

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