Iron (Fe) is the fourth most abundant element in the earth's crust and plays important roles in
both biological and chemical processes. The redox reactivity of various Fe (II) forms has …

Geochemical studies of sulfur in coals comprise several major aspects relating to the nature
and origin of sulfur in coals, including the abundance and distribution of sulfur in coal …

The iron sulfides constitute a diverse group of solids and dissolved complexes many of
which play key roles in marine systems. The group is particularly complex in the lower …

Reduced sulfur compounds are ubiquitous components of anaerobic sediments and euxinic
marine environments. They are primarily produced through a complex net of both chemically …

1. The concentration of sulphate is low in lakes and sulphur cycling has often been
neglected in studies of organic matter diagenesis in lake sediments. The cycling of sulphur …

The sequestration of sulfur within sedimentary pyrite is a major sink in the global
biogeochemical sulfur cycle and has consequent impacts on the related cycles of carbon …

Pyrite formation has been investigated at 70° C and pH 6–8 by aging precipitated,
disordered mackinawite, Fe9S8, and greigite, Fe3S4, in solutions containing aqueous H2S …

Bacteria are small, prokaryotic, microorganisms that are ubiquitous in surface and
subsurface terrestrial and aquatic habitats. Prokaryotes comprise two Domains …

A kinetic study of the reaction where FeS is precipitated FeS, H2S (aq) is aqueous H2S,
FeS2 is pyrite, and H2 (g) is hydrogen gas, shows that the rate between 25 and 125° C can …

The reactions of Fe (II) and Fe (III) solutions with polysulfide solutions prepared from freshly
synthesized Na 2 S x (x= 2, 4, 5) were studied at 25 and 100° C over the pH range 5.5 to 8 …