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CITRIC ACIDICSC: 0855
2-Hydroxy-1,2,3-propanetricarboxylic acid
beta-Hydroxytricarballylic acid
Anhydrous citric acid
March 1998
CAS #: 77-92-9
EC Number: 201-069-1

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible.  Finely dispersed particles form explosive mixtures in air.  NO open flames.  Closed system, dust explosion-proof electrical equipment and lighting. Prevent deposition of dust.  Use water spray, powder, foam, carbon dioxide.   

 PREVENT DISPERSION OF DUST!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough. Shortness of breath. Sore throat.  Use ventilation (not if powder).  Fresh air, rest. Refer for medical attention. 
Skin Redness.  Protective gloves.  Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain.  Wear safety goggles.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal pain. Sore throat.  Do not eat, drink, or smoke during work.  Rinse mouth. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water. 

According to UN GHS Criteria

 

Transportation
UN Classification
 

STORAGE
Separated from strong oxidants, strong bases, metal nitrates and metals. Dry. 
PACKAGING
 
CITRIC ACID ICSC: 0855
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS CRYSTALS. 

Physical dangers
Dust explosion possible if in powder or granular form, mixed with air. 

Chemical dangers
Decomposes above 175°C . The solution in water is a medium strong acid. Reacts with oxidants and bases. Attacks metals. 

Formula: C6H8O7 / CH2COOH-C(OH)COOH-CH2COOH
Molecular mass: 192.1
Decomposes at 175°C
Melting point: 153°C
Solubility in water, g/100ml at 20°C: 59
Flash point: 100°C
Explosive limits, vol% in air: 0.28-2.29
Octanol/water partition coefficient as log Pow: -1.7  


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation and by ingestion. 

Effects of short-term exposure
The substance is irritating to the eyes, skin and respiratory tract. 

Inhalation risk
Evaporation at 20°C is negligible; a nuisance-causing concentration of airborne particles can, however, be reached quickly when dispersed. 

Effects of long-term or repeated exposure
The substance may have effects on the teeth. This may result in erosion. 


OCCUPATIONAL EXPOSURE LIMITS
MAK: (inhalable fraction): 2 mg/m3; peak limitation category: I(2); pregnancy risk group: C 

ENVIRONMENT
 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations
       Citric acid (FAO Nutrition Meetings Report Series 40abc)
       CITRIC ACID (JECFA Evaluation)
       Citric acid (SIDS)