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Hydrogen Sulfide (H2S)
Definition
H2S is colorless, flammable, poisonous, and corrosive gas with one sulfur atom bonded to two hydrogen atoms. Also, known as sewer gas, swamp gas, or manure gas. H2S has a noticeable rotten-egg odour detectable at concentrations as low as 0.5 ppb. Also, It is a highly flammable, explosive gas between 4% and 45% (concentration in air) which may travel to ignition sources and flash back. When ignited, it burns to produce toxic vapors and gases (sulfur oxides).