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Hydrogen sulfide is the chemical compound with the formula H2S. It is a colourless, very poisonous, flammable gas or colourless liquid at extremely low temperatures or under very high pressure. Hydrogen sulfide has the characteristic foul odour of rotten eggs at very low concentrations. At concentrations between 30-100 ppm, it has sickening sweet odour and the ability to smell it can begin to dull at 50 ppm and be completely lost [1,2].
