Diuron

  • 3-(3,4-Dichlorophenyl)-1,1-dimethylurea
Formula
C9H10Cl2N2O
Structure
Description
Diuron is a white crystalline solid. It is a wettable powder.
Uses
Herbicide.

Registry Numbers and Inventories.
CAS
330-54-1
EC (EINECS/ELINCS)
206-354-4
EC Index Number
006-015-00-9
EC Class
Carcinogenic Category 3; Harmful; Dangerous for the Environment
R 22 40 48/22 50/53
S 13 22 37 46 60 61
RTECS
YS8925000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
3077
Merck
13,3418
Beilstein/Gmelin
2215168
Beilstein Reference
4-12-00-01263
EPA OPP
35505
Swiss Giftliste 1
G-1599
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C9H10Cl2N2O
Formula mass
233.1
Melting point, °C
158 - 159
Boiling point, °C
385
Decomposition point, °C
180-190
Vapor pressure, mmHg
4E-6 (25 C)
Vapor density (air=1)
8.04
Odor Threshold Odor threshold Odorless
Solubility in water
40 mg/L
pKa/pKb
13.55 (pKa)
Partition coefficient, pKow
2.68
Heat of vaporization
63.4 kJ/mol

Hazards and Protection.
Storage
Keep in well ventilated area.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate eye protection and protective clothing to prevent skin and eye contact.
Respirators
Use NIOSH/MSHA approved respirator appropriate for exposure of concern.
Small spills/leaks
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: If dissolved, in region of 10 ppm or greater concentration, apply activated carbon at ten times the spilled amount. Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
Stable.
Incompatibilities
Incompatible with the following: Strong acids.
Decomposition
Diuron, stable under normal conditions, decomposed on heating to 180 to 190 C giving dimethylamine and 3,4-dichlorophenylisocyanate. When heated to decomposition it emits highly toxic fumes of hydrogen chloride and nitrogen oxides.

Fire.
Flash Point,°C
187
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.)
Fire potential
Nonflammable.
Combustion products
Highly toxic fumes are imminent Decomposes at 180 to 190C

Health.
Exposure limit(s)
NIOSH REL: TWA 10 mg/m3
Carcinogin
CP65
Poison_Class
4
Exposure effects
   Ingestion
Nausea, vomiting, and diarrhea may be noted following ingestion.
   Inhalation
INHALATION: May cause irritation of nose and throat. EYES: Irritation. SKIN: Moderately irritating to skin.
   Skin
Cyanosis unresponsive to oxygen therapy may be noted in patients with methemoglobinemia due to absorption of excessive amounts of these agents.
   Eyes
See inhalation

First aid
 
   Ingestion
Seek medical attention. If individual is drowsy or unconscious, do not give anything by mouth; place individual on the left side with the head down. Contact a physician, medical facility, or poison control center for advice about whether to induce vomiting. If possible, do not leave individual unattended.
   Inhalation
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
3077
Response guide
USCG CHRIS Code
DIU
 
Std. Transport #
4962621