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  • Title: Sulfur isotope effects associated with oxidation of sulfide by O2 in aqueous solution.
    Author: Fry B, Ruf W, Gest H, Hayes JM.
    Journal: Isot Geosci; 1988; 73():205-10. PubMed ID: 11538336.
    Abstract:
    Normal sulfur isotope effects averaging epsilon = -5.2 +/- 1.4% (s.d.) were consistently observed for the oxidation of sulfide in aqueous solution. Reaction products were sulfate, thiosulfate and sulfite at pH 10.8-11 in distilled water; S0 was formed in two experiments with synthetic seawater at pH 8-9.5. Because the -5.2% normal isotope effect differs significantly from the previously measured +2% inverse effect associated with anaerobic oxidation of sulfide by photosynthetic bacteria, stable sulfur isotopic measurements are potentially useful for distinguishing aerobic vs. anaerobic sulfide oxidation in marine and freshwater sulfureta.
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