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MCPA
ICSC: 0054
Peer-Review Status: 27.11.2009 Validated
4-Chloro-2-methylphenoxyacetic acid
4-Chloro-o-tolyloxyacetic acid
2-Methyl-4-chlorophenoxyacetic acid 
CAS #: 94-74-6 RTECS #: AG1575000
UN #: 3077
EC #: 607-051-00-3
EINECS #: 202-360-6
    Formula: C9H9ClO3
Molecular mass: 200.6

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Not combustible. Liquid formulations containing organic solvents may be flammable. Gives off irritating or toxic fumes (or gases) in a fire.    In case of fire in the surroundings, use appropriate extinguishing media. 
EXPLOSION Risk of fire and explosion if formulations contain flammable/explosive solvents.     
 
EXPOSURE   PREVENT DISPERSION OF DUST!   
Inhalation Cough. Sore throat. Headache. Nausea.  Use local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness. Pain.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention . 
Eyes Redness. Pain. Burns. Blurred vision.  Wear safety goggles or eye protection in combination with breathing protection if powder.  Rinse with plenty of water (remove contact lenses if easily possible). Refer immediately for medical attention. 
Ingestion Burning sensation in the throat and chest. Abdominal pain. Nausea. Diarrhoea. Unconsciousness. Vomiting. Weakness. Shock or collapse.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Give one or two glasses of water to drink. Refer immediately for medical attention. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: filter respirator for organic gases and particulates adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into sealable containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations.  Do not transport with food and feedstuffs. 
EC Classification
Symbol: Xn, N; R: 22-38-41-50/53; S: (2)-26-37-39-60-61 
UN Classification
UN Hazard Class: 9; UN Pack Group: III 
GHS Classification
Signal: Danger
Harmful if swallowed
Harmful if inhaled dust
Causes skin irritation
Causes serious eye damage
May cause respiratory irritation
Very toxic to aquatic life with long lasting effects 
correxcl mark;warnenviro;aqua

EMERGENCY RESPONSE SAFE STORAGE
  Provision to contain effluent from fire extinguishing. Separated from strong bases and food and feedstuffs. Store in an area without drain or sewer access. Cool. 

IMPORTANT DATA
Physical State; Appearance
WHITE CRYSTALLINE POWDER WITH CHARACTERISTIC ODOUR. 

Physical dangers
No data. 

Chemical dangers
Decomposes on heating. This produces toxic and corrosive fumes including hydrogen chloride and phosgene. The substance is a weak acid. Attacks many metals in the presence of water. 

Occupational exposure limits
TLV (NOT-ESTABLISHED):.
MAK (not established):. 

Routes of exposure
The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion. 

Inhalation risk
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly on spraying or when dispersed, especially if powdered. 

Effects of short-term exposure
The substance is irritating to the skin and respiratory tract. The substance is corrosive to the eyes. The substance may cause effects on the nervous system and heart when ingested in large amounts. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Melting point: 113-119°C
Relative density (water = 1): 1.3
Solubility in water: none
Vapour pressure, Pa at 20°C: (negligible)
Octanol/water partition coefficient as log Pow: 2.8  
The substance is very toxic to aquatic organisms. This substance does enter the environment under normal use. Great care, however, should be taken to avoid any additional release, for example through inappropriate disposal. 

NOTES
MCPA is a chlorophenoxy-herbicide which, as a group, has been classified as possibly carcinogenic to humans.
Depending on the degree of exposure, periodic medical examination is suggested.
Carrier solvents used in commercial formulations may change physical and toxicological properties. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations
       MCPA (IARC Summary & Evaluation, Volume 30, 1983)