Micrometric pyrite catalyzes abiotic sulfidogenesis from elemental sulfur and hydrogen.

ABSTRACT: Hydrogen sulfide (H₂S) in environments with temperatures below 100 °C is generally assumed to be of microbial origin, while abiotic H₂S production is typically restricted to higher temperatures (T). In this study, we report an abiotic process for sulfidogenesis through the reduction of elemental sulfur (S⁰) by hydrogen (H₂), mediated by pyrite (FeS₂). The process was investigated in detail at pH 4 and 80 °C, but experimental conditions ranged between 40 and 80 °C and pH 4-6. The experiments were conducted with H₂ as reducing molecule, and µm-sized spherical (but not framboidal) pyrite particles that formed in situ from the H₂S, S⁰ and Fe²⁺ present in the experiments. Fe monosulfides, likely m

SUBMITTER: van der Graaf CM 

PROVIDER: S-EPMC11291890 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature