Aluminum speciation in soil solutions: Equilibrium calculations |
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| Authors: | Paul A Arp Rock Ouimet |
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| Institution: | 1. Department of Forest Resources, University of New Brunswick, E3B 6C2, Fredericton, New Brunswick, Canada
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| Abstract: | A computer simulation was done to illustrate how the equilibrium solubility and speciation of Al in well-aerated soil solutions may be affected by pH (from 2.0 to 10.0), organic acids (citric, oxalic, phthalic, and salicylic acid), metal ions (K, Mg, Ca, Al, Fe), inorganic ligands (F, OH, SO4, PO4, CO3, and SiO3), and type of Al-containing solid kaolinite, gibbsite, or amorphous Al(OH)3] thought to be present. The simulation indicated that the type of Al-oxide/hydroxide considered has a substantial influence on the inorganic and organic equilibrium composition of the soil solution, and on the occurrence (or non-occurrence) of other Al-minerals such as KA13(SO4)2(OH)6 (alunite) and Al(SO4)(OH)-5H2O (jurbanite). |
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