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The titer volume of the sample gives the volume of Ferrous Ammonium Sulphate required to react with the excess potassium dichromate in the solution. Similarly, the titer volume for the blank (distilled water) gives the volume of Ferrous Ammonium Sulphate required to react with the excess potassium dichromate in the blank. The equation for the titration can be expressed as:

Cr2O72 -- + FeSO4 (NH4)2SO4 = Cr+ + NH4+ + Fe 3+

From above equation it can be seen that one molecule of dichromate corresponds to one molecule of Mohr's salt. Thus, the difference in volume of excess K2Cr2O7 reacting with

Mohr's solution can be calculated from the expression:

= (Original vol. K2Cr2O7 -- vol. of K2Cr2O7 used for oxidation) solution - (Original vol. K2Cr2O7 -- vol. of K2Cr2O7 used for oxidation) blank

= (Vol. of K2Cr2O7 used for oxidation) blank - Vol. of K2Cr2O7 used for oxidation) solution

Hence, the difference in the titer volume for the solution and the blank is used to find out the Chemical Oxygen Demand directly.

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5mo ago

Potassium dichromate is used as an oxidizing agent in the chemical oxygen demand (COD) test to convert organic matter in a water sample into carbon dioxide. The principle behind this is that the potassium dichromate oxidizes the organics in the sample, producing a color change that can be measured spectrophotometrically to determine the COD of the sample.

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Q: What is principle of potassium dichromate in COD estimation?
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Mercuric sulfate is added to complex chloride (and other halogen) ions. These ions interfere in the COD digestion by complexing with the silver to reduce its catalytic effect and by reacting with the dichromate to form elemental halogens thus giving falsely high readings.


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