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Potassium dichromate: It is used as an oxidizing agent in the Walkley-Black method, which is commonly used to determine soil organic matter content. Ferrous ammonium sulphate: It acts as a reducing agent in the Walkley-Black method to react with the excess potassium dichromate. Diphenyl amine: It is used as an indicator in the Walkley-Black method to determine the endpoint of the reaction between the oxidizing and reducing agents. Sulphuric acid: It is used as a digestion reagent to facilitate the breakdown of organic matter in the soil sample.
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