The 2-Minute Rule for chemical oxygen demand test
The 2-Minute Rule for chemical oxygen demand test
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For example, In the event the COD degree inside the effluent is higher than envisioned, it could show the procedure processes are usually not Doing the job successfully. In such cases, the operator may require to regulate the remedy method parameters or investigate probable problems with the treatment method products.
This will help improve the Total environmental efficiency of industries and minimize their impact on water resources.
This worth continues to be a bad measure in the strength of natural and organic make a difference as oxygen also gets consumed from the oxidation of inorganic make a difference for example nitrates, sulfates, and lowered metallic ions, and likewise that some natural and organic resources like benzene pyridine and a few other cyclic organic and natural compounds don't get oxidized by this test.
COD is actually a crucial indicator of water high quality and is also applied in many different programs, including the adhering to:
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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.
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The dichromate COD reagent is commonly sold in a sealed vial. Sample is added towards the vial, along with the response takes place through a digestion wherever the sample is heated for 2 hrs at 150oC.
The flask (made up of the extracted O&G) is reweighed. The initial fat on the flask is subtracted and the whole O&G fat in mg is calculated. The final results give the O&G concentration in mg/L.
An prolonged UBOD (top BOD) test that check here actions oxygen use immediately after 60 days or maybe more is typically essential in wastewater permits.
COD describes the level of oxygen required to chemically stop working pollutants, while BOD indicates the amount of oxygen needed to break down organic and natural pollutants biologically with microorganisms.
Pipet two milliliters of sample into Just about every vial. Bear in mind that incorporating the sample will result in an exothermic reaction as well as the vial will grow to be warm.
It may be described as the amount of oxygen required by natural and organic make a difference inside a sample of drinking water for its oxidation by a solid oxidizing agent and is also expressed as ppm of oxygen taken from an answer of K2Cr2O7 in two varieties.
Sturdy measuring product for analyzing the pertinent climatic parameters in coating procedures in large corrosion protection.