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Hydrogen sulfide - Wikipedia, the free encycIopedia 2 ORDucNo. Hydrogen sulfide Date Recd: From Wikipedia, the free encyclopedia Hydrogen sulfide - 0 3LIo 4 I b$-- x_- -" H' Density and phase Solubility in water Melting point Boiling point Acidity (pK ) a Molecular shape Dipole moment MSDS Main hazards se . ru he t=s~&q=7783-06-4&~=1 &F)] Properties ot CAS number f c Fo op r i yr ns ig pe ht ct ow ion ne pu r r rp eq os ui es re o d nl fo y. ra ny Appearance H,S 34.082 g/mol Colorless gas. [7783-06-4 (http://www.emolecules.com/cgi-bidsearch? 1.363 g/L, gas. 0.25 g/100 ml(4O"C) -82.30"C (190.85 K) -60.28"C (2 12.87 K) 6.89 nt o Molecular formula Molar mass Hydrogen sulfide, sulfane Sulfuretted hydrogen se Systematic name Other names General .- 1%2 (See Text) Structure Bent. Co n I Page 1of 12 0.97 D Hazards External MSDS Highly toxic, highly flammable. NFPA 704 Flash point ' V -82.4"C IR:R12, R26 ........ ....... ...... R50 ........... .*..l.....*..l.*. , , 9 http://en.wikipedia.ordwiki/Hydrogen_sulfide 4/27/2007 EPA Export 25-07-2013:22:22:06 Page 4 of 12 Hydrogen sulfide - Wikipedia, the free encyclopedia Hydrogen sulfide is corrosive and renders some steels brittle, leading to sulphide stress cracking - a concern especially for handling acid gas and sour crude oil in the oil industry. (Sulfides should not be confused with sulfites or sulfates, which contain the suIfite ion SO;- and the sulfate ion SO:-, respectively.) Hydrogen sulfide burns to give the gas sulfur dioxide, which is more familiar to people as the odor of a burnt match. Occurrence nt o f c Fo op r i yr ns ig pe ht ct ow ion ne pu r r rp eq os ui es re o d nl fo y. ra ny ot he ru se . Small amounts of hydrogen sulfide occur in crude petroleum but natural gas can contain up to 28%. Volcanoes and hot springs emit some H S, where it probably arises via t e hydrolysis of sulfide minerals, i.e. MS + H,O to give M O + H2S. Normal average concentration in dean air is about 0.0001-0.0002 ppm. Co n se Deposit of sulphur on a rock, caused by volcanic gases i Sulfate-reducing bacteria obtain their energy by oxidizing organic matter or hydrogen with sulfates, producing H,S. These microorganisms are prevalent in low-oxygen environments, such as in swamps and standing waters. Sulfurreducing bacteria and some archaea obtain their energy by oxidizing organic matter or hydrogen with elemental sulfur, also producing H,S. Other anaerobic bacteria liberate hydrogen sulfide when they digest sulhrcontaining amino acids, for instance during the decay of organic matter. H,Sproducing bacteria also operate in the human coton, and the odor of flatulence is largely due to trace amounts of the gas. Such bacterial action in the mouth may contribute to bad breath. Evidence exists that hydrogen sulfide produced http://en.wikipedia.org/wiki/Hydroger-sui fide 4/2 7/2007 EPA Export 25-07-2013:22:22:06