diquat dibromide
98%tech, 40%,20%sl,
Herbicide
HRAC D WSSA 22; bipyridylium
NOMENCLATURE
diquat dibromide
IUPAC name 1,1'-ethylene-2,2'-bipyridyldiylium dibromide
CAS RN [85-00-7]; [6385-62-2] for diquat dibromide monohydrate EEC no. 201-579-4
PHYSICAL CHEMISTRY
diquat dibromide
Mol. wt. 344.1 M.f. C12H12Br2N2 Form Colourless to yellow crystals. M.p. decomposes above 325 ºC (monohydrate) V.p. <0.01 mPa (monohydrate) KOW logP = -4.60 (20 ºC) Henry 5 ´ 10-9 Pa m3 mol-1 (calc.) S.g./density 1.61 (25 ¡ãC) Solubility In water 700 g/l (20 ºC). Slightly soluble in alcohols and hydroxylic solvents (25 g/l). Insoluble in non-polar organic solvents (<0.1 g/l). Stability Stable in neutral and acidic solutions, but readily hydrolysed in alkaline solutions. DT50 at pH 7 in simulated sunlight c. 74 d. Photochemically decomposed by u.v. irradiation, DT50 <1 w.
APPLICATIONS
diquat dibromide
Biochemistry During photosynthesis, superoxide is generated, which damages cell membranes and cytoplasm. Mode of action Non-selective contact herbicide and desiccant, absorbed by the foliage, with some translocation in the xylem. Uses Pre-harvest desiccation of cotton, flax, alfalfa, clover, lupins, oilseed rape, poppies, soya beans, peas, beans, sunflowers, cereals, maize, rice, sugar beet, and other seed crops; destruction of potato haulms; and stripping of hops. Control of annual broad-leaved weeds in vines, pome fruit, stone fruit, bush fruit, strawberries (also control of runners), citrus fruit, olives, hops, vegetables, ornamental plants and shrubs, and other crops. Control of emergent and submerged aquatic weeds. Weed control on non-crop land. Weed control and tassel inhibition in sugar cane. Application rates 400-1000 g/ha. Formulation types SL; Gel. Compatibility Incompatible with alkaline materials, anionic surfactants (e.g. alkyl sulfonates or alkyl aryl sulfonates), and alkali-metal salts of hormone-type herbicides.
|
product name |
diquate dibromide 98% tc |
|
a.i.content |
98.52% |
|
2,2-bipyridine content |
0.10% |
|
water |
0.22% |
|
appearance |
pale yellow powder |
