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The Effect of Sulfur Oxidation on the Availability of Manganese¹

ABSTRACT

The purpose of this investigation was to determine the effect of bacterial oxidation of sulfur upon the release of soluble manganese from manganese dioxide. Using the soil perfusion technique it was found that the oxidation of elemental sulfur or sodium thiosulfate applied to soil resulted in a release of soluble manganese accompanied by a lowering of pH. Addition of calcium carbonate caused a decrease in the amount of soluble manganese released, although the amount of sulfate formed was not changed significantly. In pure culture studies on synthetic media, 10 times more soluble manganese was found when sulfur was oxidized by Thiobacillus thiooxidans than when the same acidity was produced by the addition of sulfuric acid. Separation of the MnO₂ from the sulfur and the bacteria by a collodion membrane did not prevent the reduction of manganese.

¹ Journal Paper No. 561, Purdue University Agricultural Experiment Station, Lafayette, Ind. Contribution from the Departments of Agronomy and Botany and Plant Pathology. This paper includes part of a thesis submitted by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Purdue University. Acknowledgment is made to the Texas Gulf Sulphur Co., for fellowship funds that helped make this study possible. Presented before Section III, Soil Science Society of America, State College, Pa., August 30, 1951.

² Formerly Graduate Fellow in Agronomy, Purdue University, now Instructor in Agronomy, Southern Illinois University; and Assistant Microbiologist, Agricultural Experiment Station, Purdue University, respectively.