What Does chemical oxygen demand Mean?
What Does chemical oxygen demand Mean?
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Homogenize 500 ml of sample for two minutes inside of a blender to make sure an excellent distribution of solids through the sample. This tends to assure typical final results and stop wild versions amongst vials.
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COD contrasts with biochemical oxygen demand (BOD), which depends on using microorganisms to stop working the natural content during the sample by aerobic respiration about an incubation time period (generally 5 days).
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It may be calculated swiftly to achieve worthwhile info on water bodies and industrial or wastewater remedy plant effluent.
Nền tảng cho thử nghiệm COD là gần như mọi hợp chất hữu cơ đều có thể bị oxy hóa đầy đủ để tạo ra dioxide cacbon bằng các chất oxy hóa mạnh trong các điều kiện axít.
Other methods like thermal biosensors use sensors to monitor COD on line at lengthy-time period in water samples. The biosensor measures the level of warmth generated in the course of the oxidation of natural and organic matter.
The largest problem with many of the possibilities is their superior Expense and the time they have to have in contrast With all the standardized technique.
Just after dilution, the resulting distinction between the Preliminary and ultimate DO looking through just has click here to be multiplied from the dilution component to ascertain the ultimate BOD end result.
Due to this fact, microbes will consume the oxygen from the receiving h2o to breakdown the natural squander. This oxygen depletion known as eutrophication and can cause the Dying of animal life.
Doing this test the right way is very important in analyzing wastewater remedy efficiency and can assist diagnose any complications in remedy.
Make certain all caps are secured tightly, then invert Each and every vial quite a few occasions. Remember website that incredibly hot vials could shatter if dropped or cooled promptly.
The dichromate approach is the most generally employed and will involve adding a recognized extra of potassium dichromate into a acknowledged quantity of sample from the existence of sulfuric acid.
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