2,4-Dichlorophenoxyacetic acid
2,4-D acid
C8H6Cl2O3 / Cl2C6H3OCH2COOH
Molecular mass: 221.0
ICSC # 0033
CAS # 94-75-7
RTECS # AG6825000
UN # 3077
EC # 607-039-00-8
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Not combustible.
Liquid formulations containing organic solvents may be flammable.
Gives off irritating or toxic fumes (or gases) in a fire.
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NO contact with oxidants.
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In case of fire in the surroundings: use appropriate extinguishing media.
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Explosion
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Exposure
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STRICT HYGIENE!
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•Inhalation
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Headache.
Nausea.
Weakness.
Cough.
Sore throat.
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Local exhaust or breathing protection.
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Fresh air, rest.
Refer for medical attention.
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•Skin
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Redness.
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Protective gloves.
Protective clothing.
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Remove contaminated clothes.
Rinse and then wash skin with water and soap.
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•Eyes
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Redness.
Pain.
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Safety goggles
or
eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Abdominal pain.
Burning sensation.
Diarrhoea.
Headache.
Nausea.
Vomiting.
Weakness.
Unconsciousness.
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Do not eat, drink, or smoke during work.
Wash hands before eating.
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Rinse mouth.
Give a slurry of activated charcoal in water to drink.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Personal protection: P2 filter respirator for harmful particles.
Do NOT let this chemical enter the environment.
Sweep spilled substance into covered plastic containers; if appropriate, moisten first to prevent dusting.
Carefully collect remainder,
then remove to safe place.
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Store in an area without drain or sewer access.
Separated from
strong oxidants,
food and feedstuffs
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Do not transport with food and feedstuffs.
Marine pollutant.
Xn symbol
R: 22-37-41-43-52/53
S: 2-24/25-26-36/37/39-46-61
UN Hazard Class: 9
UN Packing Group: III
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Important Data
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Physical State; Appearance:
COLOURLESS
CRYSTALS
OR WHITE POWDER
Physical Dangers:
Chemical Dangers:
The substance decomposes
on heating
producing
toxic fumes
including
hydrogen chloride
.
Reacts with strong oxidants causing fire and explosion hazard.
Attacks some forms of coatings and metals.
Occupational Exposure Limits:
TLV: 10 mg/m3 as TWA; A4 (not classifiable as a human carcinogen); (ACGIH 2005).
MAK: (Inhalable fraction) 1 mg/m3 skin absorption (H);
Peak limitation category: II(8); Pregnancy risk group: C;
(DFG 2005).
OSHA PEL: TWA 10 mg/m3
NIOSH REL: TWA 10 mg/m3
NIOSH IDLH: 100 mg/m3 See: 94757
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation of its aerosol,
through the skin
and
by ingestion.
Inhalation Risk:
A harmful concentration of airborne particles can be reached quickly on spraying or when dispersed, especially if powdered.
Effects of Short-Term Exposure:
The substance
is irritating to
the skin
and
the respiratory tract
and
the eyes
.
At high levels
the substance may cause effects on the nervous system.
Effects of Long-Term or Repeated Exposure:
(See Notes).
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Physical
Properties
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Decomposes below boiling point
Melting point: 140°C
Relative density (water = 1): 0.7 - 0.8
Solubility in water, g/100 ml at 25°C: 0.031
(very poor)
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Vapour pressure, Pa at 25°C: 0.01
(
negligible
)
Octanol/water partition coefficient as log Pow: 2.81
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Environmental
Data
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The substance is harmful to aquatic organisms.
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.
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N O T E S
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2,4-D is a chlorophenoxy-herbicide which, as a group, has been classified by IARC (1987) as possibly carcinogenic to humans, but the data on this specific substance are inconclusive.
Carrier solvents used in commercial formulations may change physical and toxicological properties.
Transport Emergency Card: TEC (R)-90GM7-III
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ADDITIONAL INFORMATION
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ICSC: 0033
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2,4-D
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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