- Diquat dibromide
- 1,1'-Ethylene-2,2'-bipyridyllium dibromide
Colorless to yellow crystals.
Contact herbicide used also to produce desiccation & defoliation.
Registry Numbers and Inventories.
EC Index Number
Very toxic; Toxic; Harmful; Irritant; Sensitising; Dangerous for the Environment
Agricultural Chemical and Pesticide; Mutagen; Reproductive Effector; Human Data; Primary Irritant
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Vapor pressure, mmHg
<0.00001 (25 C)
1.22-1.27 g/cm3 (20 C)
Solubility in water
Partition coefficient, pKow
Hazards and Protection.
Keep containers tightly closed in a well ventilated area away from food products. Keep away from heat and water.
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.
Wear appropriate protective gloves, clothing and goggles.
Wear positive pressure self-contained breathing apparatus (SCBA).
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
When heated to decomposition, diquat dibromide emits very toxic fumes of nitrogen oxides and hydrogen bromide.
Use method most appropriate to fight surrounding fire.
When heated to decomposition, diquat dibromide emits very toxic fumes of nox and hbr.
NIOSH REL: TWA 0.5 mg/m3
Diquat has not produced any pathological evidence of neurotoxicity or neurological lesions in experimental animals, although at high doses, depression, lethargy, collapse, coma, and death were seen. 1. In human diquat poisonings, approximately 50% of patients have neurologic effects (e.G., Nervousness, agitated behavior, combativeness, diminished reflexes, lethargy, inability to recognize familiar persons, nonsensical statements, stupor, coma). A. The cause of these effects is not known. Onset has been observed as early as the first day following the poisoning. Seizures may occur with severe intoxication. Diquat has not been associated with teratogenicity or adverse reproductive effects.
Overexposure to diquat spray mist may result in upper respiratory tract irritation with epistaxis, sore throat, coughing, chest tightness, and breathing difficulties. Systemic diquat toxicity does not involve the development of pulmonary fibrosis.
Severe skin irritation or burns may result from prolonged direct contact. Diquat can be absorbed through damaged or injured skin, resulting in systemic poisoning. Absorption through intact skin is minimal.
Eye contact with diquat concentrate or strong solutions may result in severe irritation. No permanent eye damage has been reported in humans.
Ipecac induced vomiting is not recommended because of the potential for cns depression, seizures and cardiovascular instability.
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
Remove and isolate contaminated clothing and shoes. Remove material from skin immediately. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
Immediately flush with running water for at least 20 minutes.
I; II; III
USCG CHRIS Code