Natural acidification processes result in increasing solubility of aluminium as soils become more acid. Exchangeable aluminium provides a large reserve that can be mobilized by percolating acids or salts, with solution pH determining the upper limit of its solubility. Aluminium can also be mobilized within soils and into drainage waters in soluble complexes with silica or fluoride, and in organically complexed forms.
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Bryon W. Bache (1985) studied this question.
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