COD testing Fundamentals Explained

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The “cod” symbol will flash for 3 seconds, then the sample test final result will look from the Screen as section for every million COD. File the test result.

BOD and COD correlate with each other in just about all samples, but BOD is always reduce than COD given that the biochemical breakdown of organics is commonly not as finish given that the chemical method.

Discharge permits may perhaps stipulate a particular highest focus for BOD or COD, or simply a % removing. Some plants require attaining up to 90% elimination of oxygen demand.

Safe the cap on to Each and every COD vial. Be certain not to overtighten the cap as it could damage the closure.

Colorimetry also helps make measurement effortless given that the many analyst really should do is digest the samples and Allow the instrument do the do the job. For these factors, colorimetry is the commonest method to evaluate COD.

Ion-Selective Electrodes (ISEs): Ion-selective electrodes are exclusively intended to selectively interact with a selected ion inside the h2o sample. check here They have an ion-certain membrane that enables the passage of just the concentrate on ion whilst blocking other ions.

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Just after dilution, the ensuing difference between the initial and last DO looking through only needs to be multiplied by the dilution component to determine the ultimate BOD final result.

Checking COD aids in optimizing remedy functions and making certain compliance with regulatory specifications.

The test involves the use of hazardous chemicals that has to be disposed of thoroughly and may constitute a chance to your operators.

TOC test treatments are fairly straightforward and straight-forward, but are precise to the sort of carbon-analyzing instrument utilized while in the laboratory. Therefore, no “common” TOC process exists. The instrument producer's processes must be followed properly to obtain the most beneficial effects.

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