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This article in SSSAJ

  1. Vol. 44 No. 3, p. 630-634
    Received: Nov 24, 1978
    Accepted: Jan 14, 1980

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Characterization of Hydroxy-Aluminum Solutions1

  1. J. L. Bersillon,
  2. Pa Ho Hsu and
  3. F. Fiessinger2



Hydroxy-Al solutions were prepared and characterized with sulfate precipitation, resin treatment, and rate of Al-ferron color development. The results suggest that the soluble Al species can be grouped into at least four categories: (i) high OH-Al polymers — these have a residual positive charge of 0.33 or less per Al atom and are rapidly precipitable by Na2SO4, giving rise to the formation of noncrystalline basic aluminum sulfate; (ii) medium OH-Al polymers — these form crystalline basic aluminum sulfate of composition Al(OH)2.50(SO4)0.22 · xH2O slowly and enter resin slowly; (iii) low OH-Al polymers — these are not precipitable with Na2SO4, and they enter resin rapidly; and (iv) monomeric ions — these enter resin rapidly and react with ferron rapidly.

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