Rotten eggs

Physical Properties. Hydrogen sulfide, H2S, is a colorless gas having a characteristic rotten-egg odor. The physical properties of hydrogen sulfide are given in Table 2. 

Fuel sulfur is also responsible for a phenomena known as storage and release of sulfur compounds. Sulfur oxides (S02,S02) easily react with ceria, an oxygen storage compound incorporated into most TWC catalysts, and also with alumina. When the air/fuel mixture temporarily goes rich and the catalyst temperature is in a certain range, the stored sulfur is released as H2S yielding a rotten egg odor to the exhaust. A small amount of nickel oxide incorporated into the TWC removes the H2S and releases it later as SO2 (75—79). 

Hydrogen sulfide Refinery gases, crude oil, sulfur recovery, various chemical industries using sulfur compounds Petroleum and chemicals Kraft pulping process Foul odor of rotten eggs irritating to eyes and respiratory tract darkening exterior paint... 

Corrosion products and deposits. All sulfate reducers produce metal sulfides as corrosion products. Sulfide usually lines pits or is entrapped in material just above the pit surface. When freshly corroded surfaces are exposed to hydrochloric acid, the rotten-egg odor of hydrogen sulfide is easily detected. Rapid, spontaneous decomposition of metal sulfides occurs after sample removal, as water vapor in the air adsorbs onto metal surfaces and reacts with the metal sulfide. The metal sulfides are slowly converted to hydrogen sulfide gas, eventually removing all traces of sulfide (Fig. 6.11). Therefore, only freshly corroded surfaces contain appreciable sulfide. More sensitive spot tests using sodium azide are often successful at detecting metal sulfides at very low concentrations on surfaces. 

Hydrogen Sulfide HjS Cause of rotten egg odor corrosion Aeration, chlorination, highly basic anion exchange... 

Observable Characteristics - Physical State (as shipped) Solid or liquid Color Colorless solid or brownish liquid Odor Characteristic like rotten eggs or garlic. 

Observable Cbaracteristics - Physical State (as normally shipped) Liquid Color. Light lemon pale yellow amber to dark red Odor. Rotten eggs. 

Rotten Egg Smell a) Manganese green-sand filter up to 6 ppm HjS with pH not lower than 6.7... 

Hydrogen sulfide gas Hydrogen sulfide is a gas with a rotten egg odor. This gas is produced under anaerobic conditions. Hydrogen sulfide is particularly dangerous because it dulls your sense of smell so that you don t notice it after you have been around it for a while and because the odor is not noticeable in high concentrations. The gas is very poisonous to your respiratory system, explosive, flammable, and colorless. 

Flydrogen sulphide H,S Corrosion (rotten egg smell) Aeration Clilorinatitfn Ozone... 

Hydrogen sulfide A highly toxic gas with the characteristic smell of rotten eggs. 

When present in low concentrations the presence of hydrogen sulfide can be detected by its characteristic odor of rotten eggs. 

Hydrogen sulfide gas (H2S) is responsible for die fiwl odor of rotten eggs. When it reacts with oxygen, sulfur dioxide gas and steam are produced. 

If you ve worked with H2S in the laboratory, you won t soon forget its rotten-egg odor. In a sense, it s fortunate that hydrogen sulfide has such a distinctive odor. This gas is highly toxic, as poisonous as HCN. At a concentration of 10 parts per million, H2S can cause headaches and nausea at 100 ppm it can be fatal. 

Methyl parathion is a pesticide that is used to kill insects on crops. Usually, it is sprayed on the crops. Methyl parathion comes in two forms a pure form of white crystals and a technical-grade solution (brownish liquid), which contains methyl parathion (80%) and inactive ingredients in a solvent. The technical-grade methyl parathion smells like rotten eggs or garlic. Methyl parathion is a manufactured chemical, so it is found in the environment only as a result of its manufacture or use. Methyl parathion has been manufactured in the United States since 1952 and has been used to kill insects on many types of crops since this time. Because methyl... 

Odor Characteristic, iike rotten eggs or gariic Keith and Waiters 1985 Weiss 1986... 

Hydrogen sulfide is a toxic gas with the foul odor of rotten eggs. The Lewis structure of H2 S shows two bonds and two lone pairs on the S atom. Experiments show that hydrogen sulfide has a bond angle of 92.1°. We can describe the bonding of H2 S by applying the orbital overlap model. 

Corrosion of buried structures has been blamed on the sulfate-reducing bacteria (SRB) for well over a century. It was easy to blame the SRB for the corrosion as they smelled very bad (rotten egg smell). It is now known that SRB are one component of the MIC communities required to get corrosion of most buried structures. 

Hydrogen sulfide is a colorless gas that smells like rotten eggs. Because of its smell, it is often called stink gas or sewer gas. It is also poisonous. Because of its toxic nature, and smell, a Kipp s apparatus generating hydrogen sulfide gas should always be kept under a fume hood. 

Lamentably, Leblanc s method produced as much pollution as soda and devastated entire communities. For each ton of washing soda made, three-quarters of a ton of intensely acidic hydrogen chloride gas spewed into the air. Raining down as hydrochloric acid, it turned trees and hedges into gaunt skeletons and poisoned farmland. Tens of thousands of tons of sulfur compounds were piled around the factories. As hydrochloric acid poured into waterways, it combined with the sulfur to make hydrogen sulfide gas, spreading a rotten egg smell for miles around. 

Hydrogen sulfide is a colorless, flammable gas under normal conditions. It is commonly known as hydrosulfuric acid, stink damp, and sewer gas. Hydrogen sulfide smells like rotten eggs. People can smell hydrogen sulfide at concentrations as low as 0.5 parts of hydrogen sulfide per billion parts of air (ppb, 1 ppb is 1,000 times less than 1 part per million [ppm]). However, at concentrations over 100 ppm most people can no longer smell hydrogen sulfide, which makes it... 

Odor Odor threshold Characteristic of rotten eggs Budavari et al. 1996... 

The "smelly shoe" of the elements. The oxidation product S02 has an acrid, burning smell, the reduction product H2S stinks like rotten eggs and is very toxic. Sulfur is, nevertheless, a most useful element. It occurs in elemental form and has therefore been known for a long time is mentioned in the Old Testament. Its main application today is in the production of fertilizers. Considerable amounts of sulfur are used in tire production for vulcanization. Sulfur is also a component of gunpowder. Physiologically indispensable as thioacetic acid and especially the S-S bridges that fix proteins in their shapes (e.g. insulin, but also in perms). A 70-kg human being contains 140 g of sulfur. 

Sulfur compounds are renowned for unpleasant odors beginning with the rotten egg smell of H2S and many are responsible for the off-flavors of various foods. Nevertheless, some sulfur compounds provide the pleasant odors associated with many plants and are also prominent in desirable food flavors. The determination of flavor or aroma is very complex since large numbers of components may be involved both for microorganisms and plants. Many flavor compounds, of course, do not contain sulfur. Much has been and continues to be written. We can only convey an eclectic flavor of the many situations involving sulfur compounds - a tasting menu. The colorful language of experts in aroma and taste bears a close resemblance to that of enophiles. 

Clear white to yellow-pink deliquescent crystals with an odor like rotten eggs due to formation of hydrogen sulfide. Commercial material may be yellow or brick-red lumps or flakes. It is unstable and discolors upon exposure to air. It undergoes autoxidation to form polysulfur, thiosulfate, and sulfate. It absorbs carbon dioxide from the air to form sodium carbonate. Moist sodium sulfide is spontaneously flammable upon drying in air. This material is hazardous through ingestion and produces local skin/eye impacts. 

Colorless gas with a strong odor of rotten eggs detectable at 0.005 ppm. However, it can cause olfactory fatigue and the sense of smell is not reliable. Used industrially to produce elemental sulfur, sulfuric acid, and heavy water for nuclear reactors. 

Colorless gas with an odor of rotten eggs. This material is hazardous through inhalation and produces local skin/eye impacts. 

---