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  Encyclopedia of Keywords > Nature > Chemistry > Chemical Elements > Sulfur > Sulfide   Michael Charnine

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  1. A sulfide is a molecule with the form R-S-R', where R and R' are organic groups. (Web site)
  2. Sulfide is also a slightly archaic term for thioether s, a common type of organosulfur compound that are well known for their bad odors. (Web site)
  3. Sulfide was repeatedly added into the bioreactor and oxidized by the cells to sulfur. (Web site)
  4. Sulfide was accumulated near the vent due to the loss of magma velocity at the vent interface. (Web site)
  5. Sulfide is too strong a base to coexist with water. (Web site)


  1. When sulfide minerals undergo weathering in contact with aerated water, sulfur is oxidized to yield sulfate ions that go into solution in the water.

Dimethyl Sulfide

  1. For example, dimethyl sulfide with oxidation state of -2 is oxidized to dimethyl sulfoxide with oxidation state 0. (Web site)
  2. These bacteria produce compounds like hydrogen sulfide, methyl mercaptan, dimethyl sulfide and dimethyl disulfide.
  3. Hydrogen sulfide, dimethyl sulfide, and mercaptans are the three most common sulfides responsible for landfill odors.


  1. Low Levels of H2S The odor or hydrogen sulfide gas can be perceived at levels as low as 10 ppb (parts per billion).
  2. Some forms of bacteria use hydrogen sulfide (H2S) in the place of water as the electron donor in a primitive photosynthesis-like process.
  3. A few covalent sulfur compounds, such as carbon disulfide (CS2) and hydrogen sulfide (H2S) are also considered to be sulfides.

Elemental Sulfur

  1. The odor associated with rotten eggs is due to hydrogen sulfide (H2S) and organic sulfur compounds rather than elemental sulfur.
  2. In a apparatus connected at the outlet side, the hydrogen sulfide can then be oxidized via conventional methods to elemental sulfur. (Web site)
  3. These bacteria utilize the hydrogen sulfide and carbon dioxide to produce elemental sulfur. (Web site)


  1. Sulfate taken up by the roots is the major source for growth; it is reduced to sulfide and then can be metabolized further and incorporated into cysteine.
  2. More compounds were produced in the reaction of HMF with cysteine (63) than were formed in the reaction with hydrogen sulfide (33). (Web site)

Sodium Sulfide

  1. The impurities in waste water from the petroleum refineries include ammonium sulfide, sodium sulfide, potassium sulfide, mercaptans and hydrogen sulfide. (Web site)
  2. The requirement for cysteine was satisfied by cystine, glutathione, or sodium sulfide. (Web site)
  3. The water-containing non-crystalline sodium sulfide can be prepared by cooling an aqueous solution of sodium sulfide to a solid state. (Web site)

Carbon Monoxide

  1. Common reductants (substances readily oxidized) are the active metals, hydrogen, hydrogen sulfide, carbon, carbon monoxide, and sulfurous acid. (Web site)

Carbonyl Sulfide

  1. Carbonyl sulfide is the chemical compound with the formula OCS. Commonly written as COS, it is a colourless gas with an unpleasant odor.
  2. The present invention is directed primarily to an improvement in the process of hydrolysis of carbonyl sulfide in removing sulfur from exhaust gas. (Web site)
  3. Carbonyl sulfide is the major sulfur compound naturally present in the atmosphere at 0.5 (± 0.05) ppb and is an important part of the global sulfur cycle. (Web site)

Chemical Compound

  1. A selenide is a chemical compound in which selenium serves as a anion with oxidation number of -2, much as sulfur does in a sulfide.
  2. Zinc sulfide (or zinc sulphide) is a chemical compound with the formula Zn S. Zinc sulfide is a white- to yellow-colored powder or crystal.
  3. Cadmium sulfide is a chemical compound with the formula CdS. Cadmium sulfide is yellow in colour and is a semiconductor.

Cadmium Sulfide

  1. Silver sulfide minerals in the ore follow the lead sulfide stream and cadmium sulfide follows the zinc. (Web site)
  2. The sulfate anion, SO 2− 4 Sulfides (S 2−), a complex family of compounds usually derived from S 2−. Cadmium sulfide (CdS) is an example. (Web site)
  3. Cadmium sulfide is soluble in acids and this has been investigated as a method of extracting the pigment from waste polymers e.g.


  1. The feces are black and the breath smells of hydrogen sulfide. (Web site)


  1. Fumarole: A vent or opening through which issue steam, hydrogen sulfide, or other gases. (Web site)


  1. Further, the bioreduction process is very slow, whereby there is hardly any possibility of accumulation of any hydrogen sulfide in the system. (Web site)


  1. The hydrogen sulfide removed and recovered by the amine gas treating unit is subsequently converted to elemental sulfur in a Claus process unit.


  1. Sulfur analog of alcohol is called thiol (or mercaptan), and ether analog is called sulfide. (Web site)
  2. For example, methyl sulfide can mean CH 3 -SH. The preferred descriptor for such SH-containing compounds is thiol or mercaptan, i.e. (Web site)


  1. After conversion to hydrogen sulfide, the sulfur will be removed from the fluid stream by the absorbing composition. (Web site)
  2. The anode is usually made of magnesium metal, which can supply electrons that aid in the conversion of sulfate to hydrogen sulfide gas. (Web site)


  1. Mercury sulfide, mercuric sulfide, or mercury(II) sulfide is a chemical compound composed of the chemical elements mercury and sulfur. (Web site)
  2. These sources of sulfide to surface waters can alter the aqueous speciation of soft metals such as mercury and silver.


  1. Upon removal of the iron slag, the copper(I) sulfide that remains is reduced to copper by heating in a controlled amount of air.
  2. Arsenopyrite also called mispickel (Fe S As) is the most common mineral from which, on heating, the arsenic sublimes leaving ferrous sulfide.


  1. The apparent absence of pufM signatures of purple sulfur bacteria is an enigma considering the abundance of sulfide in Lake Fryxell (Fig. (Web site)
  2. Consumption of sulfide (2 mM) in DTA brine medium was roughly proportional to growth for CVO and FWKO B (Fig. (Web site)
  3. In view of the fact that some sulfide can be produced from thiosulfate (10, 11), we conclude that sulfide induces FCSD expression (Fig.


  1. FWKO B grew by reduction of elemental sulfur to sulfide using hydrogen as an electron donor and CO 2 as its sole carbon source (Tables 1 and 2). (Web site)
  2. He was persistent in studying these results and eventually isolated cadmium metal by roasting and reduction of the sulfide. (Web site)
  3. However, hydrogen sulfide can be produced through reduction of the -SH functional group in the amino acid cysteine (present in many proteins) by bacteria. (Web site)

Sulfide Ores

  1. The most common are known as sulfide ores in which the copper is chemically bonded with sulfur. (Web site)
  2. Sulfur dioxide arises from the combustion of sulfur or the roasting of sulfide ores in air. (Web site)
  3. Sulfide ores, and pyrites in particular, have caused and continue to cause difficulty in recovering the gold values from these ores.


  1. In the series of leaching vessels the sulfide minerals of copper, zinc and nickel are oxidated to corresponding ammonia sulfate complexes. (Web site)
  2. The sulfide formed with nickel is called ullmannite. (Web site)


  1. High concentrations of methane and sulfide in the fluids escaping from the seafloor are the principal energy sources for chemosynthesis. (Web site)
  2. The primordial atmosphere is thought to have consisted of mostly methane, carbon dioxide, water vapor, hydrogen sulfide, and ammonia. (Web site)


  1. By removing hydrogen sulfide from coal gas utilized in a combustion process, oxidation of the hydrogen sulfide to sulfur dioxide is avoided. (Web site)


  1. Silver is stable in both pure air and water, but does tarnish when it is exposed to ozone, hydrogen sulfide, or air with sulfur in it. (Web site)
  2. This metal is stable in pure air and water, but does tarnish when it is exposed to ozone, hydrogen sulfide, or air with sulfur in it. (Web site)
  3. Water solutions of hydrogen sulfide are not stable, absorbed oxygen causes the formation of elemental sulfur and the solutions become turbid rapidly.


  1. The quantity of the element added to silver alloy in accordance with the inventive method is inversely proportional to its heat of sulfide formation. (Web site)
  2. In the presence of YrhB and cystathionine, sulfide formation was indeed detected with SPME-gas chromatography-mass spectrometry (data not shown). (Web site)
  3. Growth in the presence of lead ions resulted in the formation of extracellular electron-dense particles containing lead but not sulfide or phosphate. (Web site)


  1. Bismuth(III) sulfide is a chemical compound of bismuth and sulfur. (Web site)
  2. The X-ray diffraction indicated the sulfide compound to be a g-cerium(III)sulfide. (Web site)
  3. Sb 2 S 3 forms when antimony(III) compounds are treated with hydrogen sulfide.


  1. Sulfur may be present in crude oil as hydrogen sulfide (H 2 S), as compounds (e.g. (Web site)
  2. Hydrogen sulfide often is present in wells drilled in shale or sandstone, or near coal or peat deposits or oil fields. (Web site)
  3. Typical non-hydrocarbon gases that may be present in reservoir natural gas are water vapor, carbon dioxide, helium, hydrogen sulfide, and nitrogen.

Large Amounts

  1. In the sediment, anaerobic bacteria use sulfate to oxidize this organic material, and they produce large amounts of sulfide. (Web site)
  2. Fusobacterium nucleatum, an oral bacterium, produces large amounts of hydrogen sulfide from L-cysteine by the enzymatic action of L-cysteine desulfhydrase.


  1. The capability of the mutants to oxidize sulfide, thiosulfate and sulfite under photolithoautotrophic conditions was unaltered. (Web site)
  2. Sulfite is further reduced to sulfide, which is then incorporated into the cysteine and methionine biosynthesis pathway. (Web site)


  1. For example, the breakdown of cysteine and methionine produce hydrogen sulfide and methyl mercaptan respectively. (Web site)
  2. It is possible that methionine is degraded and that free sulfide, or an oxidized form of sulfur, is released.
  3. Methionine may be an important source of sulfide in lake sediments. (Web site)


  1. A sulfide formed with tin, iron and antimony is called cylindrite. (Web site)
  2. Teallite is a sulfide mineral of tin and lead with chemical formula: PbSnS 2. It occurs in hydrothermal veins and is sometimes mined as an ore of tin. (Web site)
  3. These include zinc or tin in dilute mineral acid, and sodium sulfide in ammonium hydroxide solution. (Web site)


  1. These atoms may be present as other functional groups such as, for example, ether, sulfide, hydroxy, amide or amine. (Web site)
  2. Alkylation of an alcohol or a phenol results in an ether, while alkylation of a thiol gives a sulfide; primary and secondary amines can also be alkylated.


  1. Zinc cadmium sulfide is a mixture of zinc sulfide (ZnS) and cadmium sulfide (CdS). It is used for its fluorescent properties.
  2. Walker discovered a mixture of antimony (III) sulfide, potassium chlorate, gum, and starch could be ignited by striking against any rough surface. (Web site)
  3. Hydrogen sulfide is slightly heavier than air; a mixture of H2S and air is explosive.


  1. The influence of pH on toxicity is shown in the chapter on sulfide toxicity and the chapter on ammonia inhibited growth rate.
  2. EPA's analysis of the toxicity of hydrogen sulfide is based on the Agency's latest Toxicological Review of Hydrogen Sulfide (Ref. (Web site)


  1. The dissolved hydrogen sulfide contains sulfur which the bacteria also require in their metabolism. (Web site)
  2. Still, the toxic hydrogen sulfide could be skipped in getting the same effect of arrested metabolism. (Web site)


  1. Since YrhB has cysteine desulfhydrase activity in vitro (6), we propose that this enzyme could further produce sulfide from cysteine. (Web site)
  2. In vitro, iron sulfide at sufficient pressure and temperature catalyzes the formation of pyruvate.
  3. Several phototrophic bacteria utilize hydrogen sulfide, which is considered to be oxidized by flavocytochrome c owing to its in vitro activity.

Metallic Silver

  1. The silver sulfide is reduced to metallic silver with the sulfur ions going into solution.


  1. If the other metal is anodic relative to silver, then the silver in the sulfide will revert to metallic silver.
  2. It consists of lead sulfide, PbS, but frequently contains silver (it is mined for this metal in some localities) and other accessory metals. (Web site)
  3. In order to convert a metal oxide or sulfide to a metal, the metal oxide must be reduced either chemically or electrolytically.


  1. Usually the product of the reaction between a soluble sulfide and an oxidizing acid. (Web site)
  2. It reduces resazurin and reacts much more rapidly with O2 than does either soluble sulfide (HS)- or cysteine. (Web site)
  3. Both insoluble lead sulfide and more soluble lead nitrate were mutagenic at the HPRT locus in V79 cells. (Web site)


  1. The anode, which is usually magnesium, supplies electrons that sustain the reaction of sulfate to hydrogen sulfide gas. (Web site)
  2. MgS forms by the reaction of sulfur or hydrogen sulfide with magnesium.


  1. Mineralogy and stable isotope compositions of the carbonate and sulfide minerals. (Web site)


  1. Contribution of dietary protein to sulfide production in the large intestine: an in vitro and a controlled study in humans. (Web site)
  2. Acute (short-term) inhalation of high concentrations of carbonyl sulfide may cause narcotic effects in humans. (Web site)
  3. Hydrogen sulfide has not been shown to cause cancer in humans, and its possible ability to cause cancer in animals has not been studied thoroughly.


  1. The accumulation of nitrous oxide in the presence of 3.0 mM sulfide and nitrate indicates inhibition of nitrous oxide reductase by sulfide. (Web site)
  2. Purple nonsulfur bacteria reduce CO 2 and oxidize sulfide or thiosulfate but not elemental sulfur in the presence of the pigment bacteriochlorophyll a.
  3. Selective oxidation of thiols in the presence of other oxidizable functional groups, such as alcohol and sulfide, is a noteworthy advantage of this method.


  1. According to this invention, the chalcogenide semiconductor is made by anodizing cadmium or bismuth in a sulfide, selenide or telluride electrolyte. (Web site)
  2. Our invention is particularly useful in the recovery of copper from such sulfide ore minerals as covellite, chalcocite, bornite, and chalcopyrite. (Web site)
  3. This invention relates to the removal of carbonyl sulfide (COS) from liquid petroleum hydrocarbons by catalytic hydrolysis over alumina. (Web site)

Present Invention

  1. In accordance with the present invention, a substantially sulfide-free aqueous stream contains less than about 1 weight percent sulfide. (Web site)
  2. In accordance with another aspect of the present invention, metal sulfide nanocrystals prepared by one of the methods are provided herein. (Web site)
  3. An essentially insoluble ferrous sulfide salt in accordance with the present invention was prepared as follows. (Web site)


  1. Nature > Chemistry > Chemical Elements > Sulfur
  2. Nature > Matter > Materials > Copper
  3. Encyclopedia of Keywords > Places > Earth > Ore
  4. Nature > Matter > Atoms > Iron
  5. Substance > Compounds > Salts > Sulfate

Related Keywords

    * Ammonia * Atmosphere * Bismuth * Carbon Dioxide * Chemicals * Chloride * Compounds * Concentrations * Copper * Copper Sulfide * Cyanamide * Galena * Hydrogen * Hydrogen Sulfide * Important Compounds * Ions * Iron * Iron Sulfide * Manganese * Metals * Metal Sulfide * Metal Sulfides * Mineral * Minerals * Ore * Ores * Oxidation * Oxide * Oxidizing * Oxygen * Pyrite * Removal * Salts * Selenium * Silver * Silver Sulfide * Smell * Solution * Sulfate * Sulfates * Sulfides * Sulfide Ions * Sulfide Mineral * Sulfide Minerals * Sulfide Ore * Sulfide Oxidation * Sulfur * Sulindac * Sulindac Sulfide * Sulphide * Toxic * Zinc * Zinc Sulfide
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