COD testing Fundamentals Explained
COD testing Fundamentals Explained
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Homogenize five hundred ml of sample for 2 minutes in a blender to ensure a fair distribution of solids through the sample. This could guarantee standard outcomes and stop wild versions in between vials.
The change in DO focus above five times signifies the "oxygen demand" for respiration via the aerobic biological microorganisms within the sample.
Thus, it has been necessary to contemplate other alternatives for that modification of This system. These new ways tend to be more environmentally friendly, and in some instances, they may have lowered digestion time.
Insert the COD reagent blank into the sample compartment and press the Zero/Test crucial. The “cod” image will flash for roughly 8 seconds.
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:
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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This technique features a drinking water sample respond with a mixture of sulfuric acid and potassium dichromate within a sealed container then digested for 2 hrs at 150oC. The sample is then go through in a spectrophotometer to determine the final results. It is possible to typically find COD tests equipped in screw top vials that comprise a premeasured sulfuric acid and potassium dichromate mixture. You'll find all of CHEMetrics’ COD merchandise offerings over the AquaPhoenix estore.
With the ongoing advancements in technological innovation and also the rising emphasis on environmental security, it is anticipated click here that new and enhanced approaches for COD measurement will go on to get designed and implemented in the approaching many years.
An extended UBOD (greatest BOD) test that measures oxygen use just after 60 times or maybe more is sometimes necessary in wastewater permits.
COD describes the amount of oxygen needed to chemically break down pollutants, even though BOD signifies the amount of oxygen necessary to stop working organic and natural pollutants biologically with microorganisms.
You will find a correlation among COD and BOD, having said that, it have to be experimentally founded in advance of utilizing one particular parameter to specific another. Typically COD Assessment (that is a considerably faster plus much more precise technique) is used to estimate BOD using the proven correlation.
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