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Iron or Aluminum Coatings in Relation to Sulfate Adsorption Characteristics of Soils¹

ABSTRACT

Studies were conducted to investigate the effects of hydrous Fe- and Al-oxides in relation to pH upon SO₄ retention by Soils. "Less SO₄-retentive" soils exhibited SO₄ adsorption of the Latosols or Ando soils after coating with the hydrous oxides. The pH-dependent SO₄ retention was much more marked after the coatings were applied. Retentive soils are made much less retentive by treatments for the removal of the hydrous oxides while the less retentive soils show appreciable SO₄ adsorption when the hydrous oxides are added. In the acid range, the amount of SO₄ adsorption is essentially proportional to the amounts of hydrous Fe- or Al-oxides present. Aluminum-oxides are more effective in retaining SO₄ than Fe-oxides when both are present as coatings on soil particles. The Fe system exhibited increasing adsorption with increased acidity whereas the Al system showed a maximum at pH 4.0. Subsequent decreases of SO₄ adsorption by Al-coated soils at lower pH values were shown to be associated with dissolution of the hydrous Al oxide phase.

¹ Technical Paper No. 1785, Oregon Agr. Exp. Sta., Oregon State University, Corvallis. Supported in part through the financial assistance by the U. S. Atomic Energy Commission (No. AT(45-1) 1063).

² Formerly Assistant Professor of Soils, Oregon State University, now Associate Soil Chemist, Pineapple Research Institute, Honolulu, Hawaii; Professor of Soils, and Associate Professor of Agricultural Chemistry, Oregon State University, respectively.

Received for publication March 3, 1964. Accepted for publication May 6, 1964.