Geochemical survey samples-Determination of organic matter-Potassium dichromate oxidation-dilution thermal method

Using the dilution heat generated when the concentrated sulfuric acid and potassium dichromate solution are mixed, the carbon in the organic matter is oxidized to carbon dioxide, and Cr6 + in the potassium dichromate is reduced to Cr3 +. Solution titration. According to the change of the amount of Cr2O before and after the oxidation of organic carbon, the content of active organic matter can be calculated. This method should be carried out under the conditions of room temperature above 20 ℃, if the temperature is low, appropriate heat preservation measures should be taken

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