Iron Sulfides
Iron Sulfides - Related Videos
02:18
A Sensitive Visual Method for the Detection of Hydrogen Sulfide-Producing Bacteria
0 Views •
2025
Source: Zhu, W., & Chu, W. Sensitive Visual Method for the Detection of Hydrogen Sulfide Producing Bacteria. J. Vis. Exp. (2022)This video demonstrates a sensitive visual method for the rapid detection of hydrogen sulfide–producing bacteria. A color change from yellow to black indicates bacterial activity through the formation of bismuth sulfide.
08:45
Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes
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Cited by 3 •
2022
This article demonstrates how to prepare and administer transferrin-bound nonradioactive isotopic iron for studies of iron transport in mouse pregnancy. The approach for quantifying isotopic iron in fetoplacental compartments is also described.
02:26
Preparation and Reactions of Sulfides
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2025
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide. Asymmetrical sulfides can be synthesized by treating thiols with an alkyl halide and a...
02:17
Structure and Nomenclature of Thiols and Sulfides
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2023
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry, similar...
03:06
Culturing Mycobacterium tuberculosis Under Iron-Limited Conditions
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2025
Source: Gupta, S., et al. Isolation and Characterization of Extracellular Vesicles Produced by Iron-limited Mycobacteria. J. Vis. Exp. (2019)This video demonstrates the procedure for culturing Mycobacterium tuberculosis under iron-limited conditions to induce iron stress and promote the secretion of siderophores that support bacterial survival.
FAQs
Under reducing conditions, dissolved sulfide can react with iron ions and precipitate FeS. The key chemical control is the availability of both reactants while oxygen-poor redox conditions favor sulfide persistence. This precipitation links solution chemistry to solid formation, making iron sulfides useful indicators of how iron and sulfur are partitioned in a chemical system.
Initial FeS precipitation does not necessarily mark the final solid phase. Oxidation can drive transformation, while further sulfur incorporation can produce phases such as pyrite. Consequently, identifying an iron sulfide requires attention to the reaction history and surrounding chemical conditions, not only to the first precipitate observed. This distinction matters when interpreting changing mineral compositions.
Temperature, sulfur availability, redox state, and solution chemistry all influence which iron sulfide phase forms or remains present. These variables can alter composition, structure, and resulting properties rather than merely changing the amount of solid produced. Considering them together is essential when interpreting mineral formation or transformations in laboratory and natural chemical systems.
FeS and FeS₂ represent different points along the iron-sulfur compositional range. FeS corresponds to iron(II) sulfide, whereas FeS₂ is iron disulfide, and their distinct compositions are associated with different structures and properties. Comparing these phases helps chemists connect sulfur incorporation and redox history with the identity and behavior of the resulting solid.
A basic investigation begins by defining redox conditions, temperature, sulfur availability, and solution chemistry. Researchers then examine whether dissolved sulfide and iron ions form FeS and whether oxidation or added sulfur is associated with another phase, such as pyrite. This workflow connects observed solids with the chemical conditions that produced or transformed them.
In sediments, these solids participate in iron and sulfur cycling and can influence how contaminants move. Their formation and transformation respond to local redox conditions and solution chemistry, so changes in those conditions may alter the solid phases controlling chemical partitioning. Studying them therefore helps geochemists interpret sediment processes rather than treating sulfide minerals as inert components.
Iron sulfides matter in both corrosion studies and energy-related materials research. Their properties make them relevant to catalysis and electrochemical technologies, while their chemical transformations provide a way to connect composition with function. In chemistry, this combination supports work that ranges from understanding inorganic solids and corrosion behavior to evaluating materials for technological applications.