COMPARISON OF THE OXIDATION OF THIOSULFATE AND ELEMENTAL SULFUR BY TWO HETEROTROPHIC BACTERIA AND Thiobacillus thiooxidans

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Abstract
The rate and magnitude of the oxidation of thiosulfate (S2O3−) and elemental sulfur (S°) to sulfate, by two heterotrophic soil bacteria and Thiobacillus thiooxidans was compared in liquid medium and soil. The two heterotrophic organisms, Isolate 2, which oxidized S2O3− and Isolate 5, which oxidized S°, produced measurable and significant amounts of SO4− in liquid media and autoclaved soil.Optimum heterotrophic oxidation occurred in autoclaved soil when the inoculated organisms were provided with an organic source of carbon as glucose. Conversely, glucose inhibited oxidation by T. thiooxidans, most likely via a build up of pyruvate. Under optimum conditions in autoclaved soil the rate and magnitude of heterotrophic oxidation were similar. The rate and magnitude of the oxidation of thiosulfate (S2O3−) and elemental sulfur (S°) to sulfate, by two heterotrophic soil bacteria and Thiobacillus thiooxidans was compared in liquid medium and soil. The two heterotrophic organisms, Isolate 2, which oxidized S2O3− and Isolate 5, which oxidized S°, produced measurable and significant amounts of SO4− in liquid media and autoclaved soil. Optimum heterotrophic oxidation occurred in autoclaved soil when the inoculated organisms were provided with an organic source of carbon as glucose. Conversely, glucose inhibited oxidation by T. thiooxidans, most likely via a build up of pyruvate. Under optimum conditions in autoclaved soil the rate and magnitude of heterotrophic oxidation were similar. © Williams & Wilkins 1978. All Rights Reserved.

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