Recommendation from the Scientific Committee on Occupational Exposure Limits for Hydrogen Sulphide

IUPAC name: Hydrogen sulphide Common name: Hydrogen sulphide CAS number: 7783-06-4 Synonyms: Dihydrogen monosulphide ; dihydrogen sulphide, hydrogen sulphuric acid ; sewer gas ; stink damp ; sulphuretted hydrogen ; sulphur hydrogen EINECS 231-977-3 EC number 016-001-00-4 Molecular formula : H2S Molecular weight: 34.09 Freezing point at 101.3 kPa: -85.5 C Boiling point at 101.3 kPa: -60.7 C Vapour density (air=1): 1.19 Vapour pressure at 25.5 C: 2026 kPa Explosive limits in air (vol/vol): Lower limit: 4.3% Upper limit: 45.5% Solubility (w/w) at 20 C: 0.4% in water 2.1% in ether Odour threshold: 0.13 ppm Conversion factors at 25 C: 1 ppm = 1.394 mg/m 1 mg/m = 0.717 ppm EU classification: F+; R12 Extremely flammable T+; R26 Very toxic by inhalation. N; R50 Very toxic to aquatic organisms