The 2-Minute Rule for chemical oxygen demand test
The 2-Minute Rule for chemical oxygen demand test
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Get ready the reagent blank by getting rid of the COD vial cap and pipetting deionized h2o in lieu of sample in the vial.
The permanganate system is comparable but utilizes potassium permanganate as opposed to potassium dichromate. The closed reflux method includes heating the sample beneath reflux ailments, which boosts the fee on the reaction and allows for a shorter test length.
The COD test needs to be considered an unbiased evaluate in the natural issue within a wastewater sample rather than a substitute with the BOD test.
Wastewater generated by business, industrial and institutional amenities is often known as "high-energy" in comparison to common home wastewater.
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:
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Most pre-prepared COD vial distributors could have a return coverage for utilized COD vials to make sure that utilised vials might be returned to the vendor sealed in the first containers for suitable disposal.
This process has a h2o sample react with a mix of sulfuric acid and potassium dichromate in a sealed container after which digested for two hours at 150oC. The sample is then go through inside of a spectrophotometer to determine the outcome. You are able to generally obtain COD tests provided in screw major vials that consist of a premeasured sulfuric acid and potassium dichromate combination. Yow will discover all of CHEMetrics’ COD item offerings within the AquaPhoenix estore.
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This may be measured by progressively including a coloured indicator that reacts With all the dichromate. The resulting colour will alter when there isn't a additional dichromate to react. This conclusion point is monitored possibly visually or by means of photometry, and the quantity of indicator used can be employed to estimate the initial COD material.
There are some standardized techniques for measuring COD, but the commonest is definitely the dichromate website reactor digestion strategy which involves the reaction of sample with potassium dichromate in a sulfuric acid Resolution.
To measure COD, the drinking water sample is put inside a closed container and subjected to your potent oxidant, including potassium dichromate and sulfuric acid, for the required period and temperature.
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