Product Identification

Product Name

Sodium hydrogen sulfite

Synonyms

Sodium hydrogen sulfate

CAS

7631-90-5

Formula

HNaO4S

Molecular Weight

120.06

EINECS

231-548-0

RTECS

VZ2000000

RTECS Class

Agricultural Chemical and Pesticide; Tumorigen; Mutagen

Merck

12,8731

Beilstein/Gmelin

46102 (G)

EC Index Number

016-064-00-8

EC Class

Harmful; Contact with acids liberates toxic gas

Physical and Chemical Properties

Appearance

White crystals. Physical properties are for pure material.

Solubility in water

290 g/L (20 C)

Density

2.476 g/cm3 (20 C)

Usage

Ph adjustment, fungicide, herbicide, microbiocide.

Vapor Density

2.2

Refractive Index

1.43 - 1.47

First Aid Measures

Ingestion

If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.

Inhalation

Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.

Skin

Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Destroy contaminated shoes.

Eyes

Get medical aid immediately. Extensive irrigation is required (at least 30 minutes).

Handling and Storage

Storage

Store in a cool, dry place. Store in a tightly closed container. Do not expose to air.

Handling

Wash thoroughly after handling. Use only in a well ventilated area. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation. Wash clothing before reuse. Keep from contact with moist air and steam.

Hazards Identification

Inhalation

May cause asthmatic attacks due to allergic sensitization of the respiratory tract. May cause effects similar to those described for ingestion. May cause severe respiratory tract irritation and possible burns.

Skin

May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. May cause severe skin irritation with possible burns, especially if skin is wet or moist. May cause allergic contact dermatitis.

Eyes

Contact with eyes may cause severe irritation, and possible eye burns. May cause eye injury.

Ingestion

May cause irritation of the digestive tract. May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns. May be harmful if swallowed. Exposure may cause central nervous system depression, gastrointestinal and cardiac abnormalities. Sulfite compunds may cause a sever allergic reaction in sensitive individuals.

Hazards

Contact with metals may evolve flammable hydrogen gas.

UN (DOT)

1821

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.

Respirators

Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Exposure Effects

Prolonged or repeated skin contact may cause dermatitis. Repeated or prolonged exposure may cause allergic reactions in sensitive individuals.

Exposure limit(s)

NIOSH REL: TWA 5 mg/m3

Poison Class

3

Fire Fighting Measures

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Water runoff can cause environmental damage. Dike and collect water used to fight fire. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or regular foam.

Fire Potential

Nonflammable.

Accidental Release Measures

Small spills/leaks

Vacuum or sweep up material and place into a suitable disposal container.

Stability and Reactivity

Stability

Stable under normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents, strong acids, sodium nitrate.

Decomposition

Oxides of sulfur, sodium oxide.

Combustion Products

Decomposes with heat or oxidizing agents, releasing sulfur dioxide gas.

Transport Information

UN Number

1821

Hazard Class

8