Homogenize five hundred ml of sample for 2 minutes in a very blender to be certain a good distribution of solids through the entire sample. This can make certain typical final results and prevent wild variations between vials.

The “cod” symbol will flash for 3 seconds, then the sample test consequence will seem within the display as part per million COD. History the test end result.

Chemical oxygen demand (COD) is undoubtedly an oblique measurement of the quantity of organic and natural make any difference in the sample. With testing COD, you'll be able to measure virtually all natural and organic compounds that can be digested by a digestion reagent.

Wastewater created by commercial, industrial and institutional services is typically called "high-strength" in comparison to usual home wastewater.

Protected the cap onto Each individual COD vial. Be sure never to overtighten the cap as it could harm the closure.

It is actually inaccurate and it has a minimal Restrict of detection. As a result, it is inapplicable to river samples which are clean up and uncontaminated.

Influent waters getting into wastewater plants are large in organics plus the wastewater plant need to lessen the “natural loading” in more info advance of discharging water to your obtaining human body.

The dichromate COD reagent is usually bought inside of a sealed vial. Sample is additional to your vial, and the response happens in the course of a digestion the place the sample is heated for two several hours at 150oC.

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The significant level is the fact that after you have founded a median COD:BOD ratio for your wastewater stream, then the comparatively easy and swift COD test can be used to predict BOD with relative trustworthiness.

This can be measured by steadily adding a coloured indicator that reacts Along with the dichromate. The ensuing colour will alter when there is not any much more dichromate to respond. This close point check here is monitored possibly visually or by way of photometry, and the volume of indicator used can be used to work out the initial COD material.

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