COD test in pharma Secrets
COD test in pharma Secrets
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Chemical Oxygen Demand (COD) is defined as the level of oxygen equivalents eaten during the chemical oxidation of natural and organic make a difference by robust oxidant (e.g., potassium dichromate). The COD price implies the level of oxygen which is required with the oxidation of all organic and natural substances in drinking water in mg/l or g/m3.
Guantee that the reagent blank vial is similar lot amount as the test vials. Notice: At the very least just one reagent blank has to be operate with Each individual set of samples with Every new great deal quantity of COD test vials.
HgSO4 are included to eliminate the existence of chloride ions and silver salts to catalyze the reaction.
At present, most COD tests use potassium dichromate given that the oxidant. Potassium dichromate is actually a hexavalent chromium salt that is bright orange in color and is extremely potent.
Chemical oxygen demand is undoubtedly an index of air pollution that steps the outcome of pollutants on dissolved oxygen.
When acquiring outcomes, the analyst might make use of a CHEMetrics photometer, or any other makers’ spectrophotometer. Just before transferring on, wipe down the reagent blank and test vials till They can be clean up and dry.
Khối lượng oxy cần thiết để oxy hóa một hợp chất hữu cơ thành dioxide cacbon, amonia và nước được thể hiện dưới dạng tổng quát là:
The approaches over are reproducible and reputable, while check here they use pricey, really corrosive, hugely poisonous reagents. On top of that, employing them includes other challenges like the interference and incomplete oxidation of risky compounds.
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COD describes the amount of oxygen needed to chemically break down pollutants, when BOD implies the level of oxygen required to stop working natural pollutants biologically with microorganisms.
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Ascertain the particular focus of the solution in an effort to compute the chemical oxygen demand by standardising it.
BOD benefit approximates the quantity of oxidizable natural and organic make a difference. That's why, it truly is applied like a measure of your diploma of water pollution and waste toughness.