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NITRIC ACID ICSC: 0183
Date of Peer Review: April 1994

Concentrated Nitric Acid (70%)
CAS # 7697-37-2 HNO3
RTECS # QU5775000 Molecular mass: 63.0
UN # 2031
EC # 007-004-00-1
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible but enhances combustion of other substances. Gives off irritating or toxic fumes (or gases) in a fire.
NO contact with flammable substances. NO contact with combustibles or organic chemicals.
In case of fire in the surroundings: NO foam.
EXPLOSION Risk of fire and explosion on contact with many common organic compounds.

In case of fire: keep drums, etc., cool by spraying with water.
EXPOSURE
AVOID ALL CONTACT!

Inhalation Burning sensation. Cough. Laboured breathing. Unconsciousness. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.
Skin Corrosive. Serious skin burns. Pain. Yellow discolouration.
Protective clothing.
Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes Corrosive. Redness. Pain. Severe deep burns.
Face shield or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion Corrosive. Abdominal pain. Burning sensation. Shock.
Do not eat, drink, or smoke during work. Wash hands before eating.
Do NOT induce vomiting. Give plenty of water to drink. Rest. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Collect leaking liquid in sealable containers. Cautiously neutralize remainder with sodium carbonate. Then wash away with plenty of water. Do NOT absorb in saw-dust or other combustible absorbents. Personal protection: complete protective clothing including self-contained breathing apparatus.
Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs.
EU Classification
Symbol: O, C
R: 8-35
S: (1/2-)-23-26-36-45
Note: [B]
UN Classification
UN Hazard Class: 8
UN Pack Group: II
EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-80S2031-II or 80GO1-I
NFPA Code: H 3; F 0; R 0; OX
Separated from combustible and reducing substances, bases, food and feedstuffs, organic chemicals. Cool. Dry. Keep in a well-ventilated room.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2004

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NITRIC ACID ICSC: 0183
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS TO YELLOW LIQUID, WITH PUNGENT ODOUR.

CHEMICAL DANGERS:
The substance decomposes on warming producing nitrogen oxides. The substance is a strong oxidant and reacts violently with combustible and reducing materials, e.g., turpentine, charcoal, alcohol. The substance is a strong acid, it reacts violently with bases and is corrosive to metals. Reacts very violently with organic chemicals (e.g., acetone, acetic acid, acetic anhydride), causing fire and explosion hazard. Attacks some plastics.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 2 ppm as TWA, 4 ppm as STEL; (ACGIH 2004).
MAK: 2 ppm, 5.2 mg/m; Peak limitation category: I(1); Pregnancy risk group: IIc; (DFG 2004).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its vapour and by ingestion.

INHALATION RISK:
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is very corrosive to the eyes, the skin and the respiratory tract. Corrosive on ingestion as well. Inhalation of vapour may cause lung oedema (see Notes).

PHYSICAL PROPERTIES
Boiling point: 121C
Melting point: -41.6C
Relative density (water = 1): 1.4
Solubility in water: miscible
Vapour pressure, kPa at 20C: 6.4
Relative vapour density (air = 1): 2.2
Relative density of the vapour/air-mixture at 20C (air = 1): 1.07
ENVIRONMENTAL DATA

NOTES
Depending on the degree of exposure, periodic medical examination is suggested. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. Rinse contaminated clothes (fire hazard) with plenty of water. Other UN 2031 classification with more than 70% nitric acid, hazard class 8, subsidiary hazard 5.1, packing group I.
Card has been partly updated in April 2005. See sections Occupational Exposure Limits, Emergency Response, Notes.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2004
See Also:
        Nitric acid (CHEMINFO)