Nitrogen dioxide

Formula
NO2
Structure
Description
Red to brown gas above 21.1 Deg c; brown liquid below 21.1 Deg c; irritating odor.
Uses
Has been used to bleach flour, in nitration of organic compound & explosives, manufacture of oxidized cellulose compound (hemostatic cotton).

Registry Numbers and Inventories.
CAS
10102-44-0
EC (EINECS/ELINCS)
233-272-6
EC Index Number
007-002-00-0
EC Class
Very toxic; Corrosive
RTECS
QW9800000
RTECS class
Mutagen; Reproductive Effector; Human Data
UN (DOT)
1067
Merck
12,6700
Beilstein/Gmelin
805 (G)
RCRA
P078
Swiss Giftliste 1
G-2881
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
N2O
Formula mass
46.01
Melting point, °C
-101
Boiling point, °C
21.2
Vapor pressure, mmHg
659 (-90.81 C)
Vapor density (air=1)
1.58
Odor Threshold Odor threshold 2.0 mg/m3
Critical temperature
157.8
Critical pressure
99.96
Density
1.4494 g/cm3 (20 C)
Solubility in water
Reacts
Viscosity
0.01441 cp (15 C)
Thermal expansion
0.0037026/K
Heat of fusion
6.54 kJ/mol
Heat of vaporization
38.1 kJ/mol

Hazards and Protection.
Storage
Corrosive to steel when wet, but may be stored in steel cylinders when moisture content is 0.1% Or less store in a cool, dry, well-ventilated location. Separate from oxidizable materials. Outside or detached storage is preferred.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Do not touch or walk through spilled material. Fully encapsulating, vapor protective clothing should be worn for spills and leaks with no fire. Stop leak if you can do it without risk or turn leaking containers so that gas escapes rather than liquid. Do not direct water at spill or source of leak. Isolate area until gas has dispersed. Ventilate the area.
Stability
May form explosive mixtures with combustible materials. Reactive only under extreme conditions.
Decomposition
When heated to decomposition it emits toxic fumes of oxides of nitrogen.

Fire.
Fire fighting
To extinguish, use media most appropriate for surrounding fire.
Fire potential
Nonflammable but can support combustion.
Hazards
Vapors from liquefied gas are initially heavier than air and spread along ground. Containers may explode when heated.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
0
 
 
Reactivity
0
 
 
Special
O

Health.
Exposure limit(s)
TLV (as TWA): 3 ppm; 5.6 mg/m3; (as STEL): 5 ppm; 9.4 mg/m3 (ACGIH 1996). OSHA PEL: C 5 ppm (9 mg/m3) NIOSH REL: ST 1 ppm (1.8 mg/m3) NIOSH IDLH: 20 ppm
Poison_Class
2
Exposure effects
Dyspnea and weak, rapid pulse may develop after a delay of several hours. Fatigue, restlessness, anxiety, mental confusion, lethargy, and loss of consciousness may be noted. Nitrogen dioxide has been fetotoxic in rats and affected behavior and growth statistics in newborn mice. Methemoglobin inducers are considered harmful to the fetus.
   Ingestion
Nausea and abdominal pain may be seen.
   Inhalation
May be fatal if inhaled. Causes irritation/burns.
   Skin
Nitric oxide is a skin irritant.
   Eyes
Inflammation of the eye would be expected under conditions where nitrogen dioxide would be formed. The liquid may cause severe burns.

First aid
 
   Ingestion
Do not induce emesis - dilution: following ingestion and/or prior to gastric evacuation, immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 15 ml/kg in a child). The possible benefit of early removal of some ingested material by cautious gastric lavage must be weighed against potential complications of bleeding or perforation.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. In case of contact with liquefied gas, thaw frosted parts with lukewarm water. Effects may be delayed.
   Eyes
Immediately flush with running water for at least 20 minutes. Effects may be delayed.

Transport.
UN number
1067
Response guide
Hazard class
2.3
PRTC
T
USCG CHRIS Code
NDO, NOX