5 Simple Statements About chemical oxygen demand Explained
5 Simple Statements About chemical oxygen demand Explained
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TOC steps the full carbon content material, together with each natural and organic and inorganic carbon, although COD particularly focuses on the oxidizable natural written content.
Just after being positioned in a very sedimentation tank for added treatment prior to disposal, flocs undertake sedimentation inside the wastewater treatment course of action.
Guantee that the reagent blank vial is the same ton amount as the test vials. Observe: No less than a person reagent blank need to be run with Every list of samples with Every new large amount range of COD test vials.
Insert the COD reagent blank into the sample compartment and push the Zero/Test essential. The “cod” symbol will flash for approximately eight seconds.
At present, most COD tests use potassium dichromate given that the oxidant. Potassium dichromate is really a hexavalent chromium salt that is dazzling orange in colour and is rather powerful.
As dichromate ion oxidizes natural and organic issue while in the sample, it is actually reduced to chromic ion, which happens to be reflected by a adjust in colour from orange or yellow to inexperienced. The sample is then read in a very photometer or spectrophotometer to evaluate the change in shade.
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Chemical oxygen demand (COD) is the amount of dissolved oxygen that need to be existing in water to oxidize chemical natural components, like petroleum. COD is accustomed to gauge the limited-expression impact wastewater effluents can have around the oxygen levels of obtaining waters.
TOC test strategies are fairly uncomplicated and straight-ahead, but are certain to the type of carbon-examining instrument used in the laboratory. Thus, no “common” TOC procedure exists. The instrument producer's methods must be followed precisely to attain the most effective final results.
COD measurements check here also are employed to make certain compliance with environmental laws. Many jurisdictions have polices that specify the utmost allowable COD ranges in wastewater that may be discharged to your surroundings.
Together with the potassium dichromate in fifty% sulfuric acid Alternative, here pre-prepared COD vials also consist of silver sulfate to be a catalyst and mercuric sulfate to get rid of chloride interference. Hence, COD vials are deemed hazardous squander and should be handled and disposed of within an approved method.