The distribution of minor elements among the components of a soil developed in loess |
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| Authors: | HH Le Riche |
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| Institution: | Pedology Department, Rothamsted Experimental Station, Harpenden, Herts. Great Britain |
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| Abstract: | This previously described buried soil, developed in uniform parent material, was used to study the relative movements of elements and other soil components down the profile. Samples from all horizons were treated with hydrogen peroxide and ammonium oxalate, under ultra-violet light, to remove organic matter and sesquioxides, and the residues were subdivided into six particle size fractions.Downward movement of clay (< 0.5 μm) was accompanied by movement of extractable Al2O3 and Fe2O3, thus identifying these as part of the mobile fraction. The less close relationship of extractable Fe2O3 to the clay suggested that it also occurred partly in coarser aggregates. Proportions of minor elements extracted varied from < 1% for Sr to nearly complete extraction of Co, Cu and Mo in some horizons. The extractable fractions of most minor elements throughout the profile behaved more like Fe2O3 than Al2O3. In the extraction residues, nearly all elements were enriched in the clay fractions relative to the coarser fractions; this being greatest for V and Fe. |
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