Hydrogen Sulfide

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  • Identifiers

    CAS number
    7783-06-4

    Molecular formula
    H2S

    SMILES
    S

    Safety labels

    Flammable
    Flammable

    Acute Toxic
    Acute Toxic

    Environmental Hazard
    Environmental

  • Odor profile

    Odor impact est.
    Low

    Odor threshold

    • Odor Threshold Low: 0.001 [ppm]. Odor Threshold High: 0.13 [ppm]. Detection odor threshold from AIHA (mean = 0.0094)
    • 0.05 ppm
    • Detection limit in air: 1.30x10-1 ppm (purity not specified)
    • Detection limit in air: 1.80x10-4 ppm (purity not specified)
    • Detection limit in air: 4.7x10-3 ppm (chemically pure)
    • For more Odor Threshold (Complete) data for HYDROGEN SULFIDE (6 total), please visit the HSDB record page.

  • Properties

    XLogP3-AA
    0.5

    pKa est.
    -12.0 (strong acid)

    Molecular weight
    34.08 g/mol

    Melting point expt.

    • -121.9 °F (EPA, 1998)
    • -85.49 °C
    • -85 °C
    • -121.88 °F
    • -122 °F

    Boiling point

    • -76.59 °F at 760 mmHg (EPA, 1998)
    • -60.33 °C
    • -60 °C
    • -76.59 °F
    • -77 °F

    Flash point

    • -22.05 ˚C est.
    • 500 °F
    • Flammable gas
    • NA (Gas)

    Solubility expt.

    • 0.4 % (NIOSH, 2024)
    • 1 g dissolves in 94.3 ml absolute alcohol at 20 °C; 1 g dissolves in 48.5 mL ether at 20 °C
    • In water, 3980 mg/L at 20 °C
    • Soluble in glycerol, gasoline, kerosene, carbon disulfide, crude oil.
    • Soluble in certain polar organic solvents, notably methanol, acetone, propylene carbonate, sulfolane, tributyl phosphate, various glycols, and glycol ethers. N-Methylpyrrolidine dissolves 49 ml/g at 20 °C at atmospheric pressure.
    • 3.74 mg/mL at 21 °C
    • Solubility in water, g/100ml at 20 °C: 0.5
    • 0.4%

  • Synonyms

    • hydrogen sulfide
    • Hydrosulfuric acid
    • Dihydrogen sulfide
    • Dihydrogen monosulfide
    • Stink DAMP
    • Sulfur hydride
    • Hydrogen sulphide
    • Sulfureted hydrogen
    • 7783-06-4
    • Sewer gas
    • Hydrogen sulfide (H2S)
    • Hydrogene sulfure
    • Acide sulfhydrique
    • Schwefelwasserstoff
    • Zwavelwaterstof
    • Siarkowodor
    • Hydrogen-sulfide
    • Idrogeno solforato
    • Sulfuretted hydrogen
    • Hydrogene sulphure
    • Acide sulphhydrique
    • RCRA waste number U135
    • Hydrogen sulfuric acid
    • FEMA No. 3779
    • UN 1053
    • YY9FVM7NSN
    • Hydrogen sulfure
    • CHEBI:16136
    • DTXSID4024149
    • Sulfide, Hydrogen
    • RefChem:6446
    • DTXCID404149
    • CHEBI:33535
    • 231-977-3
    • Dihydrogen disulfide
    • sulfane
    • Cosan
    • Hepatic acid
    • Hepatic gas
    • Insoluble sulfur
    • H2S
    • Sulfur-32S
    • 63705-05-5
    • S in Steel
    • Sulfur (>80%)
    • Sulfur (>98%)
    • Caswell No. 812
    • azufre
    • dihydridosulfur
    • mercaptans
    • thiols
    • Proactiv
    • Transact
    • Thiol
    • Sulfur Blank (0 wt%) in Kerosene
    • Sulfur Blank (0 wt%) in Isooctane
    • Sulfur, Powder
    • Sulfur Blank (0 wt%) in #2 Diesel Fuel
    • PTP Sample for Sulfur in Isooctane Analysis
    • Siarkowodor [Polish]
    • Sulfur @ 0.075% (750ppm) in Isooctane
    • Hydrogen sulfide H2S
    • HSDB 5166
    • Sulfur Blank (0 wt%) in 20 cSt Mineral Oil
    • Sulfur Blank (0 wt%) in 75 cSt Mineral Oil
    • Sulfur - S @ 0 microg/g in Heavy Mineral Oil
    • Sulfur - S @ 1.00 wt% in Heavy Mineral Oil
    • Sulfur Standard: S @ 10000 microg/mL in H2O
    • Sulfur Standard: S BLK (0 wt%) in Crude Oil
    • Zwavelwaterstof [Dutch]
    • PTP Sample for Sulfur in #2 Diesel Fuel Analysis
    • Sulfur - S @ 500 microg/g in Heavy Mineral Oil
    • Sulfur Standard: S @ 250 microg/g in Isooctane
    • EINECS 231-722-6
    • NA1350
    • NA2448
    • UN1350
    • UN2448
    • Hydrogen sulfure [French]
    • PTP Sample for Sulfur in 20 cSt Mineral Oil Analysis
    • Sulfur Standard: S @ 10 microg/g in B100 Biodiesel
    • Sulfur Standard: S @ 15 microg/g in B100 Biodiesel
    • Sulfur Standard: S @ 20 microg/g in B100 Biodiesel
    • Sulfur Standard: S @ 25 microg/g in B100 Biodiesel
    • Sulfur Standard: S @ 5 microg/g in B100 Biodiesel
    • Sulfur Standard: S @ 50 microg/g in B100 Biodiesel
    • RCRA waste no. U135
    • EPA Pesticide Chemical Code 077501
    • Hydrogene sulfure [French]
    • NSC 403664
    • Sulfur Standard: S @ 100 microg/g in B100 Biodiesel
    • Sulfur Standard: S @ 500 microg/g in B100 Biodiesel
    • Acide sulfhydrique [French]
    • monosulfane
    • Schwefelwasserstoff [German]
    • theion
    • Hydrosulfurate
    • Idrogeno solforato [Italian]
    • Acnaveen
    • Cuticura
    • Eskamel
    • Hepatate
    • Merkaptan
    • Sulfides
    • organic sulfide
    • Polysulfide Oil Standard: 30,000 microg/g S in Mineral Oil
    • Sulfur Standard: S @ 10 microg/g (0.0010 wt%) in Isooctane
    • Sulfur Standard: S @ 10 microg/g (0.0010 wt%) in Kerosene
    • Sulfur Standard: S @ 10 ug/g in 70% Isooctane/30% Toluene
    • Sulfur Standard: S @ 10 ug/g in 75% Isooctane/25% Toluene
    • Sulfur Standard: S @ 10 ug/g in 80% Isooctane/20% Toluene
    • Sulfur Standard: S @ 100 ug/g in 70% Isooctane/30% Toluene
    • Sulfur Standard: S @ 100 ug/g in 75% Isooctane/25% Toluene
    • Sulfur Standard: S @ 100 ug/g in 80% Isooctane/20% Toluene
    • Sulfur Standard: S @ 15 microg/g (0.0015 wt%) in Isooctane
    • Sulfur Standard: S @ 15 ug/g in 70% Isooctane/30% Toluene
    • Sulfur Standard: S @ 15 ug/g in 75% Isooctane/25% Toluene
    • Sulfur Standard: S @ 15 ug/g in 80% Isooctane/20% Toluene
    • Sulfur Standard: S @ 20 microg/g (0.0020 wt%) in Isooctane
    • Sulfur Standard: S @ 20 ug/g in 70% Isooctane/30% Toluene
    • Sulfur Standard: S @ 20 ug/g in 75% Isooctane/25% Toluene
    • Sulfur Standard: S @ 20 ug/g in 80% Isooctane/20% Toluene
    • Sulfur Standard: S @ 25 microg/g (0.0025 wt%) in Isooctane
    • Sulfur Standard: S @ 25 ug/g in 70% Isooctane/30% Toluene
    • Sulfur Standard: S @ 25 ug/g in 75% Isooctane/25% Toluene
    • Sulfur Standard: S @ 25 ug/g in 80% Isooctane/20% Toluene
    • Sulfur Standard: S @ 250 microg/g (0.0250 wt%) in Diesel
    • hydrogen sulfide

  • Applications

    Hydrogen Sulfide (CAS 7783-06-4) is used as a key feedstock and intermediary in sulfur chemistry: it participates in sulfur-recovery processes, notably the Claus process, to supply elemental sulfur in oil, gas, and refining operations; it provides a sulfide source for the controlled precipitation of metal sulfides (for example ZnS and related materials) that are used in pigments, catalysts, and semiconductor and photonic applications; it serves as a reagent in organosulfur synthesis to introduce sulfide functionality in various compounds; it is employed as a sulfide source for metal sulfide films in coatings and electronics; and it is used in laboratory-scale syntheses and process development where sulfide chemistry is required. Subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 302.12
    methanol 468.68
    isopropanol 224.69
    water 29.12
    ethyl acetate 90.21
    n-propanol 203.48
    acetone 244.9
    n-butanol 176.3
    acetonitrile 152.87
    DMF 591.48
    toluene 32.8
    isobutanol 138.23
    1,4-dioxane 193.99
    methyl acetate 104.6
    THF 303.52
    2-butanone 124.55
    n-pentanol 110.71
    sec-butanol 154.1
    n-hexane 14.46
    ethylene glycol 207.56
    NMP 348.63
    cyclohexane 16.15
    DMSO 457.94
    n-butyl acetate 60.22
    n-octanol 58.41
    chloroform 181.98
    n-propyl acetate 49.87
    acetic acid 377.88
    dichloromethane 132.72
    cyclohexanone 133.83
    propylene glycol 196.07
    isopropyl acetate 50.84
    DMAc 282.63
    2-ethoxyethanol 141.84
    isopentanol 109.9
    n-heptane 12.4
    ethyl formate 96.5
    1,2-dichloroethane 87.37
    n-hexanol 111.13
    2-methoxyethanol 312.09
    isobutyl acetate 33.62
    tetrachloromethane 46.0
    n-pentyl acetate 52.92
    transcutol 174.15
    n-heptanol 69.14
    ethylbenzene 14.33
    MIBK 49.45
    2-propoxyethanol 164.33
    tert-butanol 219.74
    MTBE 97.83
    2-butoxyethanol 113.96
    propionic acid 188.89
    o-xylene 23.6
    formic acid 227.48
    diethyl ether 99.64
    m-xylene 23.06
    p-xylene 22.18
    chlorobenzene 54.8
    dimethyl carbonate 58.96
    n-octane 5.72
    formamide 220.45
    cyclopentanone 232.3
    2-pentanone 103.79
    anisole 46.35
    cyclopentyl methyl ether 98.65
    gamma-butyrolactone 232.98
    1-methoxy-2-propanol 205.86
    pyridine 139.09
    3-pentanone 70.88
    furfural 207.19
    n-dodecane 5.29
    diethylene glycol 168.35
    diisopropyl ether 25.64
    tert-amyl alcohol 142.3
    acetylacetone 95.19
    n-hexadecane 5.64
    acetophenone 44.9
    methyl propionate 90.53
    isopentyl acetate 49.76
    trichloroethylene 152.38
    n-nonanol 47.9
    cyclohexanol 102.41
    benzyl alcohol 56.41
    2-ethylhexanol 51.13
    isooctanol 46.48
    dipropyl ether 46.23
    1,2-dichlorobenzene 47.01
    ethyl lactate 40.24
    propylene carbonate 118.16
    n-methylformamide 266.0
    2-pentanol 102.77
    n-pentane 19.22
    1-propoxy-2-propanol 106.8
    1-methoxy-2-propyl acetate 56.16
    2-(2-methoxypropoxy) propanol 61.21
    mesitylene 15.4
    ε-caprolactone 108.25
    p-cymene 15.22
    epichlorohydrin 161.04
    1,1,1-trichloroethane 89.9
    2-aminoethanol 244.56
    morpholine-4-carbaldehyde 242.87
    sulfolane 280.68
    2,2,4-trimethylpentane 9.96
    2-methyltetrahydrofuran 177.88
    n-hexyl acetate 64.84
    isooctane 6.93
    2-(2-butoxyethoxy)ethanol 98.03
    sec-butyl acetate 29.35
    tert-butyl acetate 53.57
    decalin 7.08
    glycerin 256.86
    diglyme 143.16
    acrylic acid 196.39
    isopropyl myristate 24.69
    n-butyric acid 187.92
    acetyl acetate 62.31
    di(2-ethylhexyl) phthalate 33.49
    ethyl propionate 42.54
    nitromethane 324.68
    1,2-diethoxyethane 56.56
    benzonitrile 61.49
    trioctyl phosphate 27.75
    1-bromopropane 61.63
    gamma-valerolactone 232.23
    n-decanol 36.1
    triethyl phosphate 23.08
    4-methyl-2-pentanol 49.22
    propionitrile 105.34
    vinylene carbonate 113.15
    1,1,2-trichlorotrifluoroethane 186.78
    DMS 42.96
    cumene 12.45
    2-octanol 45.0
    2-hexanone 59.56
    octyl acetate 38.11
    limonene 25.44
    1,2-dimethoxyethane 155.85
    ethyl orthosilicate 23.34
    tributyl phosphate 27.82
    diacetone alcohol 88.54
    N,N-dimethylaniline 36.99
    acrylonitrile 137.68
    aniline 80.14
    1,3-propanediol 237.74
    bromobenzene 43.66
    dibromomethane 98.44
    1,1,2,2-tetrachloroethane 132.67
    2-methyl-cyclohexyl acetate 31.5
    tetrabutyl urea 38.55
    diisobutyl methanol 26.4
    2-phenylethanol 59.35
    styrene 21.27
    dioctyl adipate 33.53
    dimethyl sulfate 95.78
    ethyl butyrate 37.38
    methyl lactate 84.67
    butyl lactate 51.27
    diethyl carbonate 27.26
    propanediol butyl ether 109.33
    triethyl orthoformate 29.74
    p-tert-butyltoluene 16.62
    methyl 4-tert-butylbenzoate 55.04
    morpholine 225.96
    tert-butylamine 128.2
    n-dodecanol 28.17
    dimethoxymethane 179.24
    ethylene carbonate 85.87
    cyrene 64.86
    2-ethoxyethyl acetate 59.13
    2-ethylhexyl acetate 39.96
    1,2,4-trichlorobenzene 58.55
    4-methylpyridine 118.31
    dibutyl ether 33.81
    2,6-dimethyl-4-heptanol 26.4
    DEF 124.37
    dimethyl isosorbide 81.71
    tetrachloroethylene 103.25
    eugenol 65.83
    triacetin 49.3
    span 80 76.94
    1,4-butanediol 106.68
    1,1-dichloroethane 102.74
    2-methyl-1-pentanol 73.79
    methyl formate 172.05
    2-methyl-1-butanol 112.23
    n-decane 7.69
    butyronitrile 100.85
    3,7-dimethyl-1-octanol 39.81
    1-chlorooctane 25.19
    1-chlorotetradecane 11.65
    n-nonane 7.43
    undecane 6.19
    tert-butylcyclohexane 8.17
    cyclooctane 5.62
    cyclopentanol 168.03
    tetrahydropyran 148.61
    tert-amyl methyl ether 70.33
    2,5,8-trioxanonane 101.03
    1-hexene 39.17
    2-isopropoxyethanol 87.29
    2,2,2-trifluoroethanol 123.6
    methyl butyrate 59.99

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction