COD testing Secrets
COD testing Secrets
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The permanganate approach is yet another prevalent method for measuring COD. It consists of introducing a identified surplus of potassium permanganate to a recognized quantity of sample in the presence of sulfuric acid.
The probable distinction between the reference electrode and the pH electrode is used to ascertain the pH worth of the drinking water sample.
This process is similar to your dichromate process but utilizes potassium permanganate in lieu of potassium dichromate. It has the advantage of having the ability to differentiate concerning biologically obtainable and inert natural and organic make any difference, but it's significantly less correct and more time-consuming when compared to the dichromate process.
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An additional tactic is the usage of biosensors, which can provide authentic-time, ongoing measurement of COD. These devices use microorganisms or enzymes to oxidize the organic and natural matter, and the amount of oxygen eaten is measured using an oxygen sensor.
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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Yet another problem is The shortcoming of the normal COD ways to differentiate involving biologically readily available and inert organic issue. This can result in overestimation of the level of oxygen necessary for biological here cure procedures.
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Each individual vial is blended effectively and placed in the reactor block for two hours. After two hours, the vials are removed from the block to some cooling rack for about 15 minutes.
A COD reactor/heating (a hundred and fifty°C) block and also a colorimeter are turned on to ensure each devices are permitted to stabilize.
COD signifies the diploma of contamination in h2o bodies as a consequence of natural matter. It is actually outlined because the oxygen evaluate reminiscent of the information of natural and organic matter current inside of a sample that potent chemical oxidants, potassium permanganate or potassium dichromate, can oxidize.
Therefore, these reagents are perfect for plan Examination where by no or really very low chloride concentrations are envisioned.
Along with the potassium dichromate in fifty% sulfuric acid Remedy, pre-prepared read more COD vials also consist of silver sulfate like a catalyst and mercuric sulfate to get rid of chloride interference. Hence, COD vials are regarded hazardous squander and should be managed and disposed of within an authorized way.