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A hydrochemical and multi-isotopic study of groundwater sulfate origin and contribution in the coal mining area
2022, Ecotoxicology and Environmental SafetyCitation Excerpt :In addition, as industry and agriculture have developed and urbanization has accelerated, the input of human activities (domestic sewage, mine drainage, and fertilizer) has also become one of the main sources of SO42-. δ34S and δ18O-SO42- can be used to determine the sources of SO42- and sulfur cycling pathways and to evaluate the transformation of SO42- (Sun et al., 2017; Lamban et al., 2015; Tweed et al., 2006; Pawellek et al., 2002; Krouse et al., 1991). Different potential sources of SO42- have different δ34S and δ18O-SO42- compositions.
Towards a holistic sulfate-water-O<inf>2</inf> triple oxygen isotope systematics
2022, Chemical GeologyCitation Excerpt :A comparison between the measured and corrected triple oxygen isotope data is shown in the supplementary information (Fig. S1). Our compilation of paired sulfate-water data from the oxidation of different sulfur species (Fig. 3) shows the δ18O difference between sulfate and ambient water (∆δ18Osulfate−water) varies from −77.3‰ (Krouse et al., 1991) to +34.7‰ (Sun et al., 2015). Such scatter is inconsistent with narrow ranges of H2O- and O2‑oxygen in sulfate and constant sulfate-water fractionation factors.
Stable isotopes (H, O, S) signatures evidencing evolutionary trends of Brazilian spas groundwaters
2020, Journal of Geochemical ExplorationSignature of oxygen and sulfur isotopes of sulfate in ground and surface water reflecting enhanced sulfide oxidation in mine areas
2019, Applied GeochemistryCitation Excerpt :In mining areas, oxidation of sulfide minerals and organic sulfur compounds (e.g. in coal mines) are often predominant, while in surrounding areas mineralization of soil organic sulfur, dissolution of primary sulfate minerals such as gypsum and anhydrite, use of fertilizer, or atmospheric sulfate deposition constitute sources of sulfate that often have distinct isotopic compositions (Mayer, 2005). In addition, δ34Ssulfate and δ18Osulfate may increase due to bacterial sulfate reduction (BSR), and oxygen isotope may also be exchanged between sulfite and ambient water during BSR (Betts and Voss, 1970; Krouse et al., 1991; Hubbard et al., 2009). Hence, careful evaluation of S and O isotope fractionation effects is required if the isotopic composition of sulfate is used for identification of sources of dissolved sulfate in aqueous systems.
Oxygen and sulfur isotope systematics of sulfate produced during abiotic and bacterial oxidation of sphalerite and elemental sulfur
2012, Geochimica et Cosmochimica ActaCitation Excerpt :The δ34S and δ18O values of the product sulfate provide important insights into the oxidation pathways of sulfides and potential bacterial influences. Experimental and theoretical studies of the oxidation of pyrite and other metal sulfides have shown that the proportion of oxygen derived from O2 that is incorporated into sulfate varies from 12% to 87.5% (Taylor et al., 1984b; Toran and Harris, 1989; Krouse et al., 1991; Balci et al., 2007). Incorporation of O2 into intermediate sulfoxyanions and sulfate is also possible during abiotic oxidation of sulfite and sulfide to sulfate at neutral pH (Lloyd, 1968).