COD testing Secrets

It entails using electrodes and also the measurement of electrical probable, present, or impedance to ascertain the concentration or Homes of sure compounds or ions in h2o.

The “cod” symbol will flash for 3 seconds, then the sample test consequence will look inside the Screen as aspect per million COD. File the test outcome.

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The COD test is really a practical evaluate of effluent top quality of the wastewater treatment method plant. It offers a quick, approximate evaluate of all chemically oxidizable substances and can be used to establish effectiveness issues in therapy amenities.

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You might also consider the usage of dichromate by investigating the improve from the absorbance in the sample. The samples soak up at a selected wavelength mainly because of the color of trivalent chromium (Cr3+) and hexavalent chromium (Cr6+).

Within the presence of a powerful oxidising agent within an acidic website environment, almost any natural and organic part will oxidise to carbon dioxide, based on the COD testing strategy.

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The COD test takes advantage of a chemical (potassium dichromate inside a fifty% sulfuric acid Answer) that “oxidizes” both equally natural (predominate) and inorganic substances inside a wastewater sample, which ends up in a higher COD concentration than BOD concentration for the same wastewater sample given that only natural and organic compounds are consumed throughout BOD testing.

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The dichromate technique would be the most widely employed and involves incorporating a acknowledged excessive of potassium dichromate to the known quantity of sample in the existence of sulfuric acid.

COD measurements are applied to watch and Management the treatment method processes within a wastewater remedy plant. By measuring the COD inside the influent and effluent, operators can decide the efficiency from the treatment processes and make adjustments as needed.