Effect of selective removal of organic matter and iron oxides on the specific surface areas of some tropical soil clays
2000
Osei, B.A., Department of Soil Science, School of Agriculture, University of Cape Coast, Cape Coast,Ghana | Singh, B., Department of Soil Science, The University of Reading, Whitenights, Reading RG6 6DW, England
The effect of selective removal of organic matter and amorphous and crystalline iron oxides on N2 -BET specific surface areas of some soil clays was evaluated. Clay fractions from 10 kaolinitic tropical soils were successively treated to remove organic matter by oxidation with Na hypochlorite, amorphous Fe oxide with acid ammonium oxalate. and crystalline iron oxides by reductive dissolution with dithionite-citrate-bicarbonate solution. The removal of organic matter resulted in an increase of 7-70 per cent in specific surface areas of most of the samples. By contrast, the removal of amorphous and crystalline iron oxides reduced the specific surface areas of the soil clays by 5-26 per cent and 18-66 per cent, respectively. The estimated specific surface area of the crystalline iron oxides of the soil clays varied from 117 to 365 m2 g-I. The changes in specific surface area after the removal of organic matter and iron oxides could affect the physico-chemical properties of the soils.
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