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PARAQUAT DICHLORIDE ICSC: 0005
Date of peer-review: October 2001

Paraquat
1,1'-Dimethyl-4,4'-bipyridinium dichloride
Methyl viologen dichloride
CAS # 1910-42-5 CH3(C5H4N)2CH3Cl2
RTECS # DW2275000 Molecular mass: 257.2
UN # 2781
EC # 613-090-00-7
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.

In case of fire in the surroundings: powder, water spray, foam, carbon dioxide.
EXPLOSION


EXPOSURE
PREVENT DISPERSION OF DUST! STRICT HYGIENE!
IN ALL CASES CONSULT A DOCTOR!
Inhalation Cough. Sore throat. Laboured breathing. Headache. Nosebleeds.
Local exhaust or breathing protection.
Fresh air, rest. Half-upright position. Refer for medical attention.
Skin MAY BE ABSORBED! Redness.
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.
Eyes Redness. Pain.
Face shield, or eye protection in combination with breathing protection if powder.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion Sore throat. Abdominal pain. Nausea. Vomiting. Diarrhoea. (See Notes).
Do not eat, drink, or smoke during work. Wash hands before eating.
Rinse mouth. Give plenty of water to drink, or bentonite clay in water, or give a slurry of activated charcoal in water to drink. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Consult an expert! Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Sweep spilled substance into sealable containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place. Do NOT let this chemical enter the environment. Chemical protection suit including self-contained breathing apparatus.
Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs.
EU Classification
Symbol: T+, N
R: 24/25-26-36/37/38-48/25-50/53
S: (1/2-)22-28-36/37/39-45-60-61
UN Classification
UN Hazard Class: 6.1
UN Pack Group: II
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-61GT7-I
Keep in a well-ventilated room. Well closed. Separated from food and feedstuffs. Provision to contain effluent from fire extinguishing.
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 2001

SEE IMPORTANT INFORMATION ON BACK


PARAQUAT DICHLORIDE ICSC: 0005
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS HYGROSCOPIC CRYSTALS OR WHITE TO YELLOW HYGROSCOPIC CRYSTALLINE POWDER. WATER SOLUTION OF PARAQUAT DICHLORIDE IS DARK RED.

CHEMICAL DANGERS:
The substance decomposes on heating above 300C, producing toxic fumes including nitrogen oxides, hydrogen chloride. Attacks metal.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: as paraquat, respirable fraction 0.1 mg/m (ACGIH 2001). TLV: as paraquat 0.5 mg/m (ACGIH 2001). MAK: 0.1 ppm H (DFG 2000).
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 20C is negligible; a harmful concentration of airborne particles can, however, be reached quickly on spraying and when dispersed.

EFFECTS OF SHORT-TERM EXPOSURE:
The substanceis irritating tothe eyes, the skin and the respiratory tract. Inhalation of this substance may cause lung oedema (see Notes). The substance may cause effects on the kidneys, liver, gastrointestinal tract, cardiovascular system and lungs, resulting in impaired functions, tissue lesions including haemorrhage and lung fibrosis. Exposure to high concentrations may result in death. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact with skin may cause dermatitis. The substance may have effects on the nails, resulting in nail damage.
PHYSICAL PROPERTIES
Boiling point (decomposes): 300C
Melting point: 175-180C
Relative density (water = 1): 1.25
Solubility in water, g/100 ml at 20C: 70
Vapour pressure, Pa at 20C: <0.0001
Octanol/water partition coefficient as log Pow: -4.2
ENVIRONMENTAL DATA
The substance is very toxic to aquatic organisms. The substance may cause long-term effects in the aquatic environment. This substance does enter the environment under normal use. Great care, however, should be given to avoid any additional release, e.g. through inappropriate disposal.
NOTES
The toxicological information is the same for paraquat (CAS 4685-14-7). Depending on the degree of exposure, periodic medical examination is indicated. 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. The symptoms of lung fibrosis (shortness of breath, laboured breathing) do not become manifest until several days. Do NOT take working clothes home. Carrier solvents used in commercial formulations may change physical and toxicological properties. If the substance is formulated with solvents also consult the ICSCs of these materials.
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 2001

See Also:
        Paraquat (PDS)
        Paraquat (PIM 399)
        Paraquat and diquat (EHC 39, 1984)