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Reduction and Oxidation of Acid Sulfate Soils of Thailand¹

ABSTRACT

Changes in pH, oxidation potential (Eh), and the solubility of S, Al, Ca, Mg, Fe, Mn, and Si were measured in four acid sulfate soils of Thailand following reduction and subsequent oxidation. Reduced S species accumulated under anaerobic conditions, but oxidized rapidly when the systems were aerated. The SO₄ concentration in solution increased as the Eh of the soil suspensions increased and pH decreased to <4. The extreme acidity developed in all soils resulted in the dissolution of Al, Mn, Mg, and Si.

¹ Contribution from the Lab. for Wetland Soils and Sediments, Louisiana State Univ, Baton Rouge, LA 70803.

² Research Scientist on leave from Dep. of Land Development, Thailand; Assistant Professor, Nuclear Science, and Laboratory for Wetland Soils and Sediments; Graduate Student; and Boyd Professor, Center for Wetland Resources, respectively.

Received for publication March 31, 1986.