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Chemical oxygen demand refers back to the level of oxygen required to the chemical oxidation of natural and inorganic elements current in wastewater with oxidising brokers such as potassium permanganate, potassium dichromate, and so forth.
Chemical oxygen demand (COD) is surely an oblique measurement of the quantity of natural and organic subject inside of a sample. With testing COD, you may measure almost all natural and organic compounds which can be digested by a digestion reagent.
COD is really a essential indicator of h2o high-quality and is also utilized in many different programs, such as the pursuing:
Do có nồng độ cao trong phần lớn các loại nước thải nên chloride thông thường là nguồn quan trọng nhất trong việc gây nhiễu. Phản ứng của nó với dicromat kali như sau:
C O D = 8000 ( b − s ) n T h e t i c h m a u t h u displaystyle COD= frac 8000(b-s)n The tich mau thu
TOC actions the total amount of carbon in the water sample, together with both equally organic and website inorganic carbon compounds. It quantifies the concentration of carbon present in the sample, irrespective of its oxidizability.
Traditionally, potassium permanganate crammed this position, but it had been discovered to generally be inconsistent in its capacity to oxidize many of the organic and natural make any difference in lots of waste samples.
Regulatory Compliance: Lots of nations and regulatory bodies have set up COD limitations and recommendations for discharges into drinking water bodies. read more Monitoring COD aids assure compliance with these regulations, that happen to be designed to secure drinking water high-quality and forestall abnormal air pollution.
The measurement of COD is often carried out by adding a powerful oxidising agent, for example potassium dichromate, to some sample less than acidic ailments and heated for two several hours. The amount of dichromate remaining gives an indication of how much organic and natural make a difference was present.
Normal approach scaling utilizes exactly the same extremely poisonous reagents; Nonetheless, a diminishing of volumes of reagent required and the processing time of standardized technique allow reducing the affect of waste technology. Also, fees are lessened when obtaining statistically similar effects.
COD represents the diploma of contamination in h2o bodies resulting from natural and organic make a difference. It is actually outlined given that the oxygen evaluate similar to the articles of organic subject present within a sample that potent chemical oxidants, potassium permanganate or potassium dichromate, can oxidize.
It might be outlined as the amount of oxygen required by natural and organic subject within a sample of water for its oxidation by a robust oxidizing agent and it is expressed as ppm of oxygen taken from an answer of K2Cr2O7 in two types.
Combined with the potassium dichromate in 50% sulfuric acid Option, pre-geared up COD vials also include silver sulfate for a catalyst and mercuric sulfate to eradicate chloride interference. Hence, COD vials are regarded as dangerous squander and should be managed and disposed of within an permitted manner.