The 2-Minute Rule for chemical oxygen demand test

Within the presence of sulfuric acid, silver sulphate, and mercury sulphate, potassium dichromate oxidises the organic make a difference contained while in the water sample to supply carbon dioxide (CO2) and h2o (H2O). The amount of potassium dichromate utilised is decided by evaluating the volumes of ferrous ammonium sulphate eaten during blank and sample titrations.

This oxidation is catalyzed by silver sulfate. The catalyst is required, Primarily to oxidize very low molecular weight fatty acids. The oxidation because of the acidified dichromate can be represented by the subsequent equation:

Therefore, it has been necessary to think about other choices to the modification of This method. These new ways are more environmentally friendly, and in some cases, they have got minimized digestion time.

Insert the COD reagent blank to the sample compartment and press the Zero/Test critical. The “cod” image will flash for about eight seconds.

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COD presents a bigger quantity of modifications than one other situations in all the several actions that it's important to perform. The central place of most of these modifications is to diminish using very poisonous reagents or to alter to Other folks Which may be much more eco-friendly.

BOD refers back to the Organic oxygen demand, which steps the level of dissolved oxygen (DO) needed by aerobic organisms (oxygen demand) to stop working organic and natural squander materials existing inside of a offered drinking water sample in a presented temperature and specified time.

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COD describes the quantity of oxygen necessary to chemically stop working pollutants, while BOD implies the quantity of oxygen required to stop working natural and organic pollutants biologically with microorganisms.

Has to have an current ample microbiological inhabitants. Should the microbial population is inadequate or unidentified, a "seed" Alternative of germs is included together with A necessary nutrient buffer solution that makes sure bacteria inhabitants vitality.

To evaluate COD, the drinking water sample is placed inside of a closed container and subjected into a potent oxidant, for instance potassium dichromate and sulfuric acid, for the desired duration and temperature.

Methods concentrating on the detection method haven't but been totally made, as their only operate is for making the final response extra sensitive.