High gradient magnetic separation of some soil clays from Nigeria, Brazil and Colombia.

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Abstract
Summary: High gradient magnetic separation was used to fractionate the clay from some tropical soils. Acid‐oxalate‐extractable iron (Feox) and aluminium (Alox) and total carbon were measured in the whole clay, the magnetic fraction and the tailings. The magnetic separation resulted in a wider range of concentrations of these elements than in the whole clays. In each of the clays Feox was greater in the magnetic fraction than in the tailings; Alox was more variable. Carbon was also concentrated in the magnetic fraction suggesting that it is associated more with Feox than Alox. The relationships between Feox, Alox and carbon depend on soil classification and soil age.