There are plenty of strategies for measuring COD, Every single with its advantages and disadvantages. The most common techniques include things like the dichromate process, the permanganate strategy, and the shut reflux method.
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For most people a whole knowledge of the regular procedures necessary to precisely entire significant wastewater analytical tests will not be needed. Having said that, a basic understanding of the speculation behind, and dealing familiarity with, The essential treatments used for Just about every test along with the answers to normally asked questions about Every single test is usually a beneficial Resource for anybody linked to building, monitoring, treating, or discharging process wastewater.
COD Investigation involves the use of a strong oxidizing agent to oxidize the natural and organic compounds from the sample, as well as the eaten oxidizing agent is then measured to ascertain the COD benefit.
It can be calculated immediately to achieve important information on h2o bodies and industrial or wastewater cure plant effluent.
As dichromate ion oxidizes organic subject while in the sample, it really is reduced to chromic ion, and that is reflected by a modify in colour from orange or yellow to environmentally friendly. The sample is then study in the photometer or spectrophotometer to evaluate the alter in color.
The COD test is greatly employed as a way of measuring pollutants effecting aquatic ecosystems. Unlike the Biochemical Oxygen Demand (BOD) test, which only actions the amount of oxygen eaten by microbial oxidation, the COD test steps the oxygen eaten by chemical oxidation.
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Chemical Oxygen website Demand (COD) can be an analytical system which indirectly measures the level of oxygen needed to oxidize the organic matter within a water sample. The higher the focus of natural compounds in the sample, the increased the COD measurement is going to be.
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It entails the oxidation of organic and natural and inorganic carbon compounds existing in a water sample at large temperatures.
Chloride is the key interference when testing for COD. Each COD vial used With all the dichromate approach includes mercuric sulfate which will eliminate chloride interference approximately the extent specified in the treatment.
Environmental regulatory organizations build COD restrictions for wastewater amenities that discharge dealt with squander to receiving bodies of water. Exceeding these boundaries may result in severe fines or other penalties.
Together with the potassium dichromate in fifty% sulfuric acid Alternative, pre-well prepared COD vials also have silver sulfate being a catalyst and mercuric sulfate to eradicate chloride interference. Hence, COD vials are thought of harmful squander and has to be handled and disposed of within an authorized way.