NIOSH Pocket Guide to Chemical Hazards

Sodium bisulfite

CAS 7631-90-5

NaHSO3

RTECS VZ2000000
Synonyms & Trade Names
Monosodium salt of sulfurous acid, Sodium acid bisulfite, Sodium bisulphite, Sodium hydrogen sulfite
DOT ID & Guide
2693 154 (solution)

Exposure
Limits

NIOSH REL: TWA 5 mg/m3
OSHA PEL†: none
IDLH N.D. See: IDLH INDEX Conversion
Physical Description
White crystals or powder with a slight odor of sulfur dioxide.
MW: 104.1
BP: Decomposes
MLT: Decomposes
Sol: 29%
VP: ?
IP: NA

Sp.Gr: 1.48
Fl.P: NA
UEL: NA
LEL: NA

Noncombustible Solid
Incompatibilities & Reactivities
Heat (decomposes) [Note: Slowly oxidized to the sulfate on exposure to air.]
Measurement Methods
NIOSH 0500
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately

Breathing: Fresh air
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations Not available.
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION