The Definitive Guide to chemical oxygen demand test
The Definitive Guide to chemical oxygen demand test
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Put together the reagent blank by eliminating the COD vial cap and pipetting deionized water rather than sample in to the vial.
The standard techniques to find out COD and BOD are still widely applied given that they allow for reputable final results for being received. Despite the utilization of highly toxic reagents, COD is utilised since the reactions ensure the complete oxidation from the raw material, unlike proposals exactly where the transform in oxidizing brokers would not make it possible for this type of reaction.
BOD and COD correlate with one another in almost all samples, but BOD is always lessen than COD because the biochemical breakdown of organics is often not as entire because the chemical technique.
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This method is relatively easy and gives A fast and correct evaluate of COD. Even so, it's some down sides, including the usage of dangerous chemicals and The lack to differentiate among biologically offered and inert organic matter.
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1 vial is marked like a “blank,” and 3 or 4 vials are marked with regarded conventional levels. Two vials are then marked for that wastewater sample for making a replica operate. Notice: If numerous wastewater samples are being run, at the very least ten% of samples are duplicated.
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:
Just after dilution, the resulting difference between the First and last DO examining simply has to be multiplied via the dilution factor to find out the final BOD result.
Monitoring COD aids in optimizing remedy operations and guaranteeing compliance with regulatory requirements.
TOC steps organic carbon but various natural and organic molecules will create diverse oxygen demand. Measuring TOC on your own will not likely automatically indicate simply how much oxygen will probably be consumed by the organics in the environment. For example, oxalic acid and ethanol produce equivalent TOC effects. On the other hand, resulting from diverse oxidation states, the oxygen demand of ethanol is 6 periods increased than oxalic acid, which means ethanol can have a higher impact on the dissolved oxygen material of the acquiring drinking water.
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The two procedures for COD testing require the digestion stage, so a heating block to your samples is important for making certain precise and repeatable effects. For greatest here outcomes, hunt for a heating block that characteristics a number of temperatures, so you have utility for other tests, including complete phosphorus.
Combined with the potassium dichromate in fifty% sulfuric acid Remedy, pre-organized COD vials also incorporate silver sulfate as a catalyst and mercuric sulfate to eliminate chloride interference. As a chemical oxygen demand result, COD vials are regarded as dangerous squander and needs to be handled and disposed of in an permitted fashion.