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Reduction of Sulfate to Sulfide in Waterlogged Soil¹

ABSTRACT

A study was made of sulfate reduction to sulfide in water-logged soils supplied with an energy source. Sulfate reduction was more rapid in surface soil than in subsurface layers with sulfide appearing 2 days after waterlogging samples of a surface soil. The amount of sulfide precipitated from added H₂S in two soils was approximately equivalent to the amounts of ferrous iron released by waterlogging. Added Fe₂O₃ was effective in precipitating H₂S. Sulfate reduction was retarded by nitrate. Addition of oxygen to highly reduced soils caused a rapid decrease in sulfide content, with one-half of the sulfide being oxidized in 15 minutes and all the sulfide oxidized after 8 hours.

¹ Contribution from the Department of Agronomy, Louisiana State University, Baton Rouge, La. Presented before Div. S-3, Soil Science Society of America, Stillwater, Okla., Aug. 1966.

² Instructor, Louisiana State University at Alexandria and Professor, Louisiana State University at Baton Rouge, respectively.

Received for publication January 22, 1969. Accepted for publication June 6, 1969.