![]() ![]() When eggs are cooked for a long time, the yolk's surface may turn green. Pyrrhotite is a waste product of the Desulfovibrio bacteria, a sulfate reducing bacteria. These metal sulfides, such as iron(II) sulfide, are often black or brown, leading to the color of sludge. Some of the hydrogen sulfide will react with metal ions in the water or solid to produce iron or metal sulfides, which are not water-soluble. ![]() Iron sulfides occur widely in nature in the form of iron–sulfur proteins.Īs organic matter decays under low-oxygen (or hypoxic) conditions such as in swamps or dead zones of lakes and oceans, sulfate-reducing bacteria reduce various sulfates present in the water, producing hydrogen sulfide. In moist air, iron sulfides oxidize to hydrated ferrous sulfate.īiology and biogeochemistry An overcooked hard-boiled egg, showing the distinctive green coating on the yolk caused by the presence of iron(II) sulfide Iron sulfide reacts with hydrochloric acid, releasing hydrogen sulfide: FeS + 2 HCl → FeCl 2 + H 2S FeS + H 2SO 4 → FeSO 4 + H 2S All are black, water-insoluble solids.įeS can be obtained by the heating of iron and sulfur: Fe + S → FeSįeS adopts the nickel arsenide structure, featuring octahedral Fe centers and trigonal prismatic sulfide sites. Iron sulfides are often iron-deficient non-stoichiometric. sulphide) is one of a family of chemical compounds and minerals with the approximate formula Fe S. Iron(II) sulfide or ferrous sulfide (Br.E.
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