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Dissolved Aluminum in Acid Sulfate Soils and in Acid Mine Waters¹

ABSTRACT

Analytical data on water samples from acid sulfate soils and acid mine spoils indicate that the upper limit of dissolved Al is regulated by a basic aluminum sulfate with the stoichiometric composition AlOHSO₄. The observed solubility relationship, pAl + pOH + pSO₄ = 17.23, can be useful in defining environmental conditions in terms of pH and dissolved sulfate for the occurrence of Al concentrations toxic to plants.

¹ Investigation supported by grant W 89-2 from the Netherlands Foundation for the Advancement of Tropical Research (WOTRO).

² Soil Scientist, Dep. of Soil Science and Geology, State Agr. Univ., P.O. Box 37, Wageningen, The Netherlands.

Received for publication March 23, 1973. Accepted for publication June 25, 1973.

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