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Irrespective of its common use, there are some worries connected to COD measurement. One of many key issues is the use of hazardous chemicals while in the measurement process.
COD measurement amounts Ordinarily consider all over two hours possibly in a laboratory or with an internet based analyser, so is a more rapidly test than the usual BOD measurement which normally takes about five times.
BOD and COD are important in wastewater for deciding the level of waste from the h2o. Squander that's significant in organic and natural matter requires therapy to reduce the level of natural waste prior to discharging into obtaining waters.
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:
It is inaccurate and has a lower limit of detection. For that reason, it can be inapplicable to river samples which might be thoroughly clean and uncontaminated.
Greater COD will set stresses on aquatic organisms – The higher the COD, the quicker oxygen is depleted from the stream. This means considerably less oxygen is readily available for sorts of aquatic existence.
The future of COD measurement lies in the event of safer, more precise, plus much more effective solutions. As our understanding of the character and behavior of organic compounds in h2o improves, so far too will our capacity to measure and Regulate their impact on the setting.
The flask (made up of the extracted O&G) is reweighed. The initial weight in the flask is subtracted and the overall O&G fat in mg is calculated. The effects present the O&G focus in mg/L.
Each individual vial is more info blended very well and put in the reactor block for 2 several hours. Right after two hrs, the vials are faraway from the block to your cooling rack for approximately quarter-hour.
A COD reactor/heating (one hundred fifty°C) block as well as a colorimeter are turned on to ensure that both of those devices are allowed to stabilize.
Conductivity Measurement: Conductivity measurement relies on the power of h2o to conduct electrical present a result of the existence of ions.
In COD, it had been noticed that modifications here are associated with the change of reagents in search of quicker oxidation
BOD value approximates the amount of oxidizable organic make a difference. Consequently, it can be applied to be a evaluate of your diploma of drinking water air pollution and squander toughness.