Agent Name

Sodium hydrogen sulfide

Alternative Name

Sodium bisulfide

CAS Number

16721-80-5

Formula

H-Na-S

Major Category

Other Classes

Synonyms

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)

Category

Sulfur Compounds

Description

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]

Sources/Uses

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]

Comments

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
Lacrimator

Yes

Toxic Pneumonitis

Yes

Other Poison

Chemical Asphyxiant

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: