NIOSH Pocket Guide to Chemical Hazards

Diquat (Diquat dibromide)

CAS 85-00-7


RTECS JM5690000
Synonyms & Trade Names
Diquat dibromide; 1,1'-Ethylene-2,2'-bipyridyllium dibromide [Note: Diquat is a cation (C12H12N2++; 1,1'-Ethylene-2,2-bipyridyllium ion). Various diquat salts are commercially available.]
DOT ID & Guide
2781 151 (solid)
2782 131 (liquid)


NIOSH REL: TWA 0.5 mg/m3
OSHA PEL†: none
IDLH N.D. See: IDLH INDEX Conversion
Physical Description
Dibromide salt: Yellow crystals. [herbicide] [Note: Commercial product may be found in a liquid concentrate or a solution.]
MW: 344.1
BP: Decomposes
MLT: 635°F
Sol: 70%
VP: <0.00001 mmHg
IP: ?

Sp.Gr: 1.22-1.27
Fl.P: ?
UEL: ?
LEL: ?

Combustible Solid, but does not readily ignite and burns with difficulty.
Incompatibilities & Reactivities
Alkalis, UV light, basic solutions [Note: Concentrated diquat solutions corrode aluminum.]
Measurement Methods
None available
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Quick drench
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations Not available.
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane, respiratory system; rhinorrhea (discharge of thin mucus), epistaxis (nosebleed); skin burns; nausea, vomiting, diarrhea, malaise (vague feeling of discomfort); kidney, liver injury; cough, chest pain, dyspnea (breathing difficulty), pulmonary edema; tremor, convulsions; delayed healing of wounds
Target Organs Eyes, skin, respiratory system, kidneys, liver, central nervous system