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Characterization of Hydroxy-Aluminum Solutions¹

ABSTRACT

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.

¹ Paper of the Journal Series, New Jersey Agric. Exp. Stn., Cook College, Rutgers. The State Univ. of New Jersey, New Brunswick, NJ 08903. This research was performed as a part of NJAES Project 15520, supported by the New Jersey Agric. Exp. Stn., a grant from Nat'l. Sci. Found. (ENG 75-18069-Hsu) and a fellowship to the first author from the Ministry of Foreign Affairs, France.

² Postdoctor and Professor of Soil Chemistry, respectively. Dep. of Soils and Crops, Rutgers-The State Univ. of New Jersey; Research Coordinator, Society lyonnaize des eaux et de l'eclairage, Paris, France. The present address of the first author is Degremont, Reuil Malmaison, France.

Received for publication November 24, 1978. Accepted for publication January 14, 1980.

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