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Hydrogen Sulfide

Also known as: hydrogen sulfide · Hydrosulfuric acid · Dihydrogen sulfide · Dihydrogen monosulfide

CAS No.: 7783-06-4
Formula: H2S
Molar mass: 34.08 g/mol
PubChem CID: 402

GHS pictograms

Flammable

Compressed gas

Toxic

Harmful / Irritant

Health hazard

Environmental hazard

2D structure of Hydrogen Sulfide — 2D structure · PubChem CID 402

Summary

Hydrogen Sulfide (H2S), CAS 7783-06-4. Common in labs and industry. Read on for hazards, storage, PPE and mixing rules.

Background

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Hazards

Flammable (GHS02)

Ignites easily when exposed to a flame or spark.

Compressed gas (GHS04)

Contents under pressure, may explode if heated.

Toxic (GHS06)

May be fatal even in small doses.

Harmful / Irritant (GHS07)

May cause skin, eye or respiratory irritation.

Health hazard (GHS08)

Serious long-term health effects (CMR, respiratory sensitizer).

Environmental hazard (GHS09)

Toxic to aquatic organisms.

Hazard statements

H220: Extremely flammable gas [Danger Flammable gases]
H330: Fatal if inhaled [Danger Acute toxicity, inhalation]
H400: Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]
H280: Contains gas under pressure
H319: Causes serious eye irritation [Warning Serious eye damage/eye irritation]
H370: Causes damage to organs [Danger Specific target organ toxicity, single exposure]

Storage

Temperature

Keep at room temperature, below 30 °C, out of direct heat.

Ventilation

Store somewhere well-ventilated and away from any ignition source.

Containers

Metal drums or tinted glass, tightly sealed.

Keep away from

Strong acids, strong bases and powerful oxidizers.

Personal protective equipment

Gloves

Nitrile or butyl, at least 0.4 mm thick.

Eye protection

Safety goggles with side shields.

Respirator

A2 organic-vapor cartridge if the room isn't well ventilated.

Occupational exposure limits (HSE)

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EU harmonised classification (ECHA C&L)

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Transport

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FDA recalls & enforcement

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Compatibilities

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Practical safety notes

Flammable. Keep away from open flames, hot surfaces and sparks. Ground containers when transferring.
Compressed gas. Secure cylinders upright, protect valves, store in ventilated areas.
Acute toxicity. Work under a fume hood, restrict access, keep a specific antidote plan available.
Irritant / harmful. Ventilate the workspace and avoid skin contact.
Serious health hazard (carcinogen, mutagen, reprotoxic, respiratory sensitizer). Substitute if possible; otherwise closed systems and medical surveillance.
Environmental hazard. Do not release to sewers or waterways; collect for hazardous waste disposal.

Derived from the GHS classification shown above. These notes are generic guidance and do not replace the manufacturer's SDS or your local risk assessment.

FAQ

Is Hydrogen Sulfide flammable?+

Yes. Hydrogen Sulfide (CAS 7783-06-4) carries the GHS02 flame pictogram. Keep it away from ignition sources, use non-sparking tools, and ground metal containers when transferring liquid.

What PPE should I wear when handling Hydrogen Sulfide?+

Safety glasses with side shields and nitrile gloves are the baseline. Work inside a fume hood or use a suitable respirator. Check SDS section 8 for material-specific breakthrough times.

How should Hydrogen Sulfide be stored?+

Store Hydrogen Sulfide (CAS 7783-06-4) in tightly closed original containers, in a cool, dry, well-ventilated area away from incompatible materials. Use a flammable-liquid cabinet and keep away from oxidizers and heat.

Is Hydrogen Sulfide dangerous for the environment?+

Yes. Hydrogen Sulfide carries the GHS09 environment pictogram. Do not release to drains, soil or waterways; collect residues for hazardous-waste disposal in line with local regulations.

Where can I find the official Safety Data Sheet for Hydrogen Sulfide?+

Official, up-to-date SDS documents are published by each manufacturer (Sigma-Aldrich, Merck, Thermo Fisher, VWR, Carl Roth, etc.) and by regulators such as ECHA and NIOSH. This page is an educational summary and does not replace the manufacturer's SDS.

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