Sodium nitrite

  • Nitrous acid, sodium salt
Formula
NaNO2
Structure
Description
Light yellow or white crystals, granules, or powder, hygroscopic.
Uses
Component of heat-transfer salts, chemical in metal treatment & finishing operations, component of detinning solution & multipurpose greases, agent for recovery of tin from scrap.

Registry Numbers and Inventories.
CAS
7632-00-0
EC (EINECS/ELINCS)
231-555-9
EC Index Number
007-010-00-4
EC Class
Oxidising; Toxic; Dangerous for the Environment
R 8 25 50
RTECS
RA1225000
RTECS class
Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant
UN (DOT)
1500
Merck
12,8793
Beilstein/Gmelin
20892 (G)
EPA OPP
76204
Swiss Giftliste 1
G-2065
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
NaNO2
Formula mass
69.00
Melting point, °C
284
Vapor pressure, mmHg
0.2 (525 C)
Vapor density (air=1)
2.39
Density
2.168 g/cm3
Solubility in water
820 g/L
Dielectric constant
6.8 (25 C)
Heat of fusion
15.3 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Do not store near combustible materials. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Do not expose to air. Store protected from moisture. Store under an inert atmosphere.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid contact with clothing and other combustible materials. Do not ingest or inhale. Handle under an inert atmosphere. Store protected from air. Use only in a chemical fume hood.
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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Remove all sources of ignition.
Stability
Stable at room temperature in closed containers under normal storage and handling conditions. Unstable if heated, may explode at temperatures greater than 533 C.
Incompatibilities
Reducing agents, moisture, metals as powders (e.g. hafnium, raney nickel), ammonium salts, cyanides (e.g. potassium cyanide, sodium cyanide), amines, activated carbon, acids, organic matter, acetanilide, antipyrine, chlorates, hypophosphites, iodides, mercury salts, permanganates, sulfites, tannic acid, vegetable astringents.
Decomposition
Oxides of nitrogen, irritating and toxic fumes and gases.

Fire.
Autoignition, °C
489
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Strong oxidizer. Contact with combustible materials may cause a fire. Use water with caution and in flooding amounts. May explode from heat or contamination. May accelerate burning if involved in a fire. Extinguishing media: Use water only! Contact professional fire-fighters immediately. Cool containers with flooding quantities of water until well after fire is out. For large fires, flood fire area with water from a distance. DO NOT use dry chemicals, carbon dioxide, Halon or foams.
Fire potential
Moderately flammable. Requires moderate heating.
Hazards
These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard.
Combustion products
Toxic oxides of nitrogen may form in fires.
Health
3
 
Flammability
3
 
 
Reactivity
1
 
 
Special
O

Health.
Poison_Class
2
Exposure effects
May cause reproductive and fetal effects. Laboratory experiments have resulted in mutagenic effects. Animal studies have reported the development of tumors. Sodium nitrate may react with secondary or tertiary amines to form nitrosamines (certain nitrosamines are cancer suspect agents).
   Ingestion
Harmful if swallowed. May cause methemoglobinemia, cyanosis, convulsions, and death. Causes digestive tract irritation. Ingestion may cause weakness, muscular incoordination, fine tremors, loss of reflexes, convulsions and possible death from circulatory collapse. Ingestion may cause a decrease in blood pressure, rapid pulse and visual disturbances.
   Inhalation
May be fatal if inhaled. May cause methemoglobinemia, cyanosis, convulsions, tachycardia, dyspnea, and death. May cause acute pulmonary edema, asphyxia, chemical pneumonitis, and upper airway obstruction caused by edema.
   Skin
Causes skin irritation. May be absorbed through the skin.
   Eyes
Causes eye irritation. May cause conjunctivitis. May cause permanent corneal opacification.

First aid
 
   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. Induce vomiting by giving one teaspoon of Syrup of Ipecac.
   Inhalation
Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask. SPEED IS ESSENTIAL, OBTAIN MEDICAL AID IMMEDIATELY.
   Skin
Get medical aid. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1500
Response guide
Hazard class
5.1
Packing Group
III
 
USCG CHRIS Code
SNI
 
HS Code
2834 10 00
 
Std. Transport #
4925312
 
IMO Chemical Code
17
IMO Pollution Category
B
IMO Hazard code
S/P (-)