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- W2003733472 abstract "Abstract Organic sulfur in marine sediment is 34 S enriched relative to the co-existing pyrite. This phenomenon is still enigmatic. Timing of the sulfur incorporation, immobilization and different sulfur species involved are part of the explanations. The reduced sulfur species incorporation into organic matter (OM) is generally assumed to have negligible δ 34 S fractionation. This assumption has never been confirmed by laboratory experimental data. The present study measures the δ 34 S changes resulting from reduced sulfur species (sulfides and polysulfide anions) incorporation into organic model compounds in an aquatic and low temperature (25 °C) system that simulates diagenetic marine environment. In addition, we also investigate the δ 34 S fractionation and the isotope chemical mixing in the formation of polysulfide anions produced from elemental sulfur and sulfide anions. The results showed total isotope mixing between the two species in the formation of polysulfides. Acidification of the polysulfides solution caused δ 34 S fractionation between the released elemental sulfur and H 2 S. The incorporation of polysulfides and sulfides into carbonyl groups, caused 34 S enrichment relative to the starting polysulfides and sulfide of 4–5‰. The 34 S enrichment of the sulfurized carbonyl groups showed a minimal effect by temperature (0–70 °C) and is not affected by salinity, polysulfides composition, reaction time or solubility in water. The incorporation of polysulfides and sulfides into brominated organic compounds was negligibly 34 S enriched. The chemical mechanisms controlling the polysulfides incorporation into OM depend mostly on the functional groups and determine the 34 S enrichment of the sulfurized OM. The results presented in this study can explain part of the difference between pyrite δ 34 S and sulfurized OM δ 34 S in natural marine sediments." @default.
- W2003733472 created "2016-06-24" @default.
- W2003733472 creator A5006797335 @default.
- W2003733472 creator A5055383157 @default.
- W2003733472 date "2004-11-01" @default.
- W2003733472 modified "2023-10-18" @default.
- W2003733472 title "Mechanisms of sulfur introduction chemically controlled: δ34S imprint" @default.
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- W2003733472 doi "https://doi.org/10.1016/j.orggeochem.2004.06.019" @default.
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