ferrous sulfide

One of the steps in its formation involves combining pyrite (ferrous sulfide) with oxygen.

These metal sulfides, such as ferrous sulfide (FeS), are insoluble and often black or brown, leading to the dark color of sludge.

Furthermore, metal substrates (generally ferrous sulfide or other sulfides) can be applied to metal in order to prevent hydrogen embrittlement.

The degradation of cysteine releases hydrogen sulfide gas that reacts with the ferric citrate to produce ferrous sulfide.

The standard lab preparation is to react ferrous sulfide (FeS) with a strong acid in a Kipp generator:

Iron(II) sulfide or ferrous sulfide (Br.E.

For such small-scale laboratory use, H2S was made as needed in a Kipp generator by reaction of sulfuric acid (H2SO4) with ferrous sulfide FeS.

Abstract: During late summer, 1992, the water immediately overlying the sediment in the anoxic hypolimnion of Crystal Lake, Conn., was saturated with ferrous sulfide (FeS).

These are the chemicals that have been studied by Dr. Wachtershauser, whose theory is that many reactions important to the origin of life took place on the surface of ferrous sulfide, fool's gold.

Mineral species themselves could have a variable compositions, such as the sulfide mackinawite, (Fe, Ni)S, which is mostly a ferrous sulfide, but has a very significant nickel impurity that is reflected in its formula.

The presence of ferrous sulfide as a visible black precipitate in the growth medium peptone iron agar can be used to distinguish between microorganisms that produce the cysteine metabolizing enzyme cysteine desulfhydrase and those that do not.

Reaction of pyruvic acid or other α-keto acids with ammonia in the presence of ferrous hydroxide or in the presence of ferrous sulfide and hydrogen sulfide generates alanine or other α-amino acids.

The combination of ferrous sulfide and hydrogen sulfide as reducing agents in conjunction with pyrite formation - FeS + HS FeS + 2H + 2e (or H instead of 2H + 2e) - has been demonstrated under mild volcanic conditions.