Fry B, Ruf W, Gest H, Hayes J M
Department of Chemistry, Indiana University, Bloomington 47405, USA.
Isot Geosci. 1988;73:205-10. doi: 10.1016/0168-9622(88)90001-2.
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.
在水溶液中硫化物氧化过程中，始终观察到平均ε=-5.2±1.4%（标准差）的正常硫同位素效应。在蒸馏水中pH值为10.8 - 11时，反应产物为硫酸盐、硫代硫酸盐和亚硫酸盐；在两个pH值为8 - 9.5的合成海水实验中形成了单质硫。由于-5.2%的正常同位素效应与之前测得的光合细菌对硫化物进行厌氧氧化相关的+2%逆效应有显著差异，稳定硫同位素测量对于区分海洋和淡水硫化物环境中的好氧与厌氧硫化物氧化可能是有用的。
