The Dark colour of black cotton soils
| Autor: | V. S. Ramachandran, L. C. Jain, F. U. Ahmad |
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| Jazyk: | angličtina |
| Rok vydání: | 1959 |
| Předmět: | |
| Popis: | Black cotton soil from Indore (Madhya Pradesh) which is predominantly composed of montmorillonite contained 0·45% organic matter. A sensible reduction of the organic content by any method was invariably followed by a corresponding reduction in its dark colour. Treatment with 10% sodium hexametaphosphate at boiling point or with H2O2 at 80° C. or the dichromate were effective in removing the colour. NaOH does not remove the organic matter nor the dark colour of the soil except only slightly. Heating in air at 400° C. oxidises the organic matter and hence removes the colour. Heating in vacuum however is obviously ineffective. DTA studies show that the oxidation of the organic matter, which is responsible for the dark colour, occurs in stages at 325° and 410°C. |
| Databáze: | OpenAIRE |
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