Agent Name

Sodium hydrogen sulfide

Alternative Name

Sodium bisulfide

CAS Number




Major Category

Other Classes


Sodium bisulfide; Hidrosulfuro sodics [Spanish]; Hydrogen sodium sulfide; Hydrogenosulfure de sodium [French]; Sodium hydrosulfide; Sodium mercaptan; Sodium mercaptide; Sodium sulfhydrate; Sodium sulfide; Sodium hydrogensulphide; Sodium hydrosulfide solution; Sodium hydrosulfide solution (45% or less); Sodium hydrosulfide, solution; Sodium hydrosulfide, with <25% water of crystallization; Sodium hydrosulfide, with not <25% water of crystallization; [ChemIDplus] UN2949; UN2318 (less than 25% water of crystallization)


Sulfur Compounds


White to colorless crystals with an odor of hydrogen sulfide; [NIOSH] Highly hygroscopic; [Merck Index] Solution is light yellow to red with an odor of rotten eggs; [CHRIS] White or yellow crystalline solid with an odor of rotten eggs; [Alfa Aesar MSDS]


Used to dehair hides and to produce heavy water, paper, rayon, dyes, and other chemical products; [HSDB] Also used in paints, lacquers, varnishes, textiles, effluent treatment, water purification, and cosmetics; Also used as a corrosion inhibitor and coloring, complexing, and reducing agent; Used as a flotation agent in ore processing; [IUCLID]


Corrosive to skin; [Quick CPC] High inhalation exposure can induce pulmonary edema; Concentration of 600 ppm is lethal in 30 minutes; 800 ppm is lethal immediately; [HSDB] Evolves hydrogen sulfide gas on contact with water; Corrosive to skin, eyes, and respiratory tract; [CAMEO] Rapidly hydrolyzed in moist air forming sodium hydroxide and sodium sulfide; The product of commerce is usually the dihydrate; [Merck Index] Corrosive to skin, eyes, and respiratory tract; Inhalation may cause pulmonary edema; [ICSC] Short-term exposure causes severe skin irritation and possibly second-degree burns; Liquid can cause marked eye irritation, lachrymation, and corneal injury; [CHRIS]

Exposure Assessment
Vapor Pressure

49 mm Hg

Odor Threshold Low

0.0047 ppm

Explanatory Notes

Odor threshold from CHRIS; The Guide in the Emergency Response Guidebook is for "Sodium hydrosulfide, with not less than 25% water of crystallization."

Adverse Effects


Toxic Pneumonitis


Other Poison

Chemical Asphyxiant


Skin Burns

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


Chemical Information

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Related Information in HazMap

Industrial Processes with risk of exposure: