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Published in J Environ Qual 13:193-196 (1984)
© 1984 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Sulfate Production Rates in Pyritic Pennsylvanian-Aged Shales1

Calvin C. Ainsworth and R. W. Blanchar2

ABSTRACT

An incubation study was initiated to measure sulfate production within various shale layers of coal overburden. Samples of air-dried, crushed, and sieved shale were adjusted to –33 kPa moisture potential and incubated with and without inoculation by a Thiobacillus thiooxidans, ferrooxidans, and thioparus culture at 298 K in either air or CO2-enriched air. Samples were removed periodically during a 28-d incubation and analyzed for SO42-. Ninety percent of the variation in rate of pyrite oxidation was due to differences in the shale layers and there were no significant differences measured due to addition of bacteria or increased CO2 level. A zero-order rate of SO42- production with respect to SO42- level was observed in all layers. The rate constants varied from 12 to 182 mg S/kg shale per day for the various shale layers. The rate of pyrite oxidation was higher in samples with pH values near 4 than those with pH values near 6.5.

Key Words: pyrite oxidation • sulfur oxidation • sulfuric acid

NOTES

1 Contribution from the Missouri Agric. Exp. Stn. Journal Series no. 9277, approved by the Director. This research supported through SEQ-EQP (SEA-CR-1AG no. 7-6-15-2).

2 Research Associate, Illinois State Geologic Survey, Champaign, IL 61820 and Professor, Dep. of Agron., Univ. of Missouri, Columbia, MO 65211, respectively.

Received for publication February 2, 1983.




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