Diquat dibromide
Trade and Other Names: Trade names include Aquacide, Aquakill, Dextrone, Diquat, Reglone, Reglox, Reward, Tag, Torpedo, Vegetrole, and Weedtrine-D.
Introduction: Diquat dibromide is a nonselective, quick-acting herbicide and plant growth regulator, causing injury only to the parts of the plant to which it is applied. Diquat dibromide is referred to as a desiccant because it causes a leaf or an entire plant to dry out quickly. It is used to desiccate potato vines and seed crops, to control flowering of sugarcane, and for industrial and aquatic weed control. It is not residual; that is, it does not leave any trace of herbicide on or in plants, soil, or water.
Physical Properties:
Appearance: Technical diquat dibromide, which is greater than 95% pure, forms white to yellow crystals.
Chemical Name: 1,1'-ethylene-2,2'-bipyridyldiylium dibromide salt
CAS Number: 85-00-7
Molecular Weight: 344.06
Water Solubility: 700,000 mg/L @ 20 C; v.s.
Solubility in Other Solvents: i.s. in nonpolar solvents such as chloroform, diethyl ether, and petroleum ether; s.s in alcohol and hydroxylic solvents
Melting Point: Decomposes above 300 C
Vapor Pressure: Negligible @ 20 C
Partition Coefficient: -4.6021
Adsorption Coefficient: 1,000,000 (estimated)
Exposure Guidelines:
ADI: 0.002 mg/kg/day
MCL: 0.02 mg/L
RfD: 0.0022 mg/kg/day
PEL: Not Available
HA: Not Available
TLV: 0.1 mg/m3 (8-hour) (respirable fraction)