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paraquat dichloride
 
42%tech, 24%, 20%sl,
Herbicide
 
HRAC D WSSA 22; bipyridylium
 
 
 
NOMENCLATURE
 
paraquat dichloride

IUPAC name 1,1'-dimethyl-4,4'-bipyridinediium dichloride; 1,1'-dimethyl-4,4'-bipyridinium dichloride; 1,1'-dimethyl-4,4'-bipyridylium dichloride

Chemical Abstracts name 1,1'-dimethyl-4,4'-bipyridinium dichloride

Other names methyl viologen CAS RN [1910-42-5]; [2074-50-2] bis(methyl sulfate) EEC no. 217-615-7 Development codes PP148; PP910 for bis(methyl sulfate) (both ICI)

 
PHYSICAL CHEMISTRY
 
paraquat dichloride
 
Composition Not normally isolated from the tech. products, which are >95% pure. Mol. wt. 257.2 M.f. C12H14Cl2N2 Form Colourless, hygroscopic crystals. M.p. Decomposes at c. 340 ºC V.p. <1 ´ 10-2 mPa (25 °C) KOW logP = -4.5 (20 °C) Henry <4 ´ 10-9 Pa m3 mol-1 (calc.) S.g./density 1.24-1.26 (20 ºC) Solubility In water c. 620 g/l (20 ºC). Practically insoluble in most organic solvents. Stability Stable in neutral and acidic media, but readily hydrolysed in alkaline media. Photochemically decomposed by u.v. irradiation in aqueous solution.
 
 
APPLICATIONS
 
paraquat dichloride
 
Biochemistry During photosynthesis, superoxide is generated, which damages cell membranes and cytoplasm.
Mode of action Non-selective contact herbicide, absorbed by the foliage, with some translocation in the xylem.
Uses Broad-spectrum control of broad-leaved weeds and grasses in fruit orchards (including citrus), plantation crops (bananas, coffee, cocoa palms, coconut palms, oil palms, rubber, etc.), vines, olives, tea, alfalfa, onions, leeks, sugar beet, asparagus, ornamental trees and shrubs, in forestry, etc. Also used for general weed control on non-crop land; as a defoliant for cotton and hops; for destruction of potato haulms; as a desiccant for pineapples, sugar cane, soya beans, and sunflowers; for strawberry runner control; in pasture renovation; and for control of aquatic weeds. For control of annual weeds, applied at 0.4-1.0 kg/ha.
Formulation types SL.
Compatibility Incompatible with alkaline materials, anionic surfactants, and clay-containing inert materials.
 
 
CERTIFICATE OF ANALYS:
 

product name

paraquat 42% tech

paraquat 24% sl

paraquat 20% sl

appearance

dark blue to green homogeneous liquid

dark blue to green homogeneous liquid

dark blue to green homogeneous liquid

a.i. content

42.02%

24.10%

20.12%

ph value

4.5

5.8

4.6

water insoluble matter

0.10%

0.10%

0.10%

dilution stablity

/ 

qualified

qualified

 
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