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Common Name: Paraquat

Chemical Name: 1,1'-dimethyl-4.4'-bipyridilium ion

Optical Formula: C12H14N2·2X (X=Cl, CH3SO4)

Molecular Weight: 257.2 (2Cl)

CAS Registration No.: 1910-42-5

Specification: Active Ingredients: 42%

Physio-chemical Properties: Appearance: White crystalline solids

Relative Density: 1.24-1.26 (20 ℃ /20 ℃ )

Melting Point: 300 ℃

Vapor Pressure: <1.33×10-8kPa.


Freely soluble in water; Practically insoluble in hydrocarbons; Sparingly soluble in lower alcohol.Seldom insoluble in organic solvents. Stable in acidic and neutral substances. It easily hydrolyses in alkaline substances and degrades under strong light irritation. It can be inactivated by inert slit loamand negative surfactivity. Direct metal contactshould be avoided because of its corrosiveness.Paraquat dichloride (42-50% a. i.)appears dark brown. Toxicology Oral: LD50 rat (Acute): 112-150 mg/kg LD50 mice (Acute): 104 mg/kg Dermal: LD50 rat, 500 mg/kg LD50 rabbit: 204 mg/kg Eye & Skin Irritation, Moderate Oral: NED dog, 20ppm Dermal: NED rabbit (Sub-acute), 2.8mg/kg Inhalation: NED rat (Sub-acute), 0.1ug/l Oral: NED rat (chronic), 180ppm Oral: NED dog (chronic), 35ppm Carcinogenic, teratogenic and mutative effects were not observed. LC50 (rainbow trout, 48hours): 62mg/L LC50 (Carp, 48hours): 40mg/L LD50(Chicken): 300-380mg/kg LD50 (bee): 11ug/L LD50 (bird): 950-100000mg/kg

Mode of Action:  

A broad-spectrum contact herbicide. Dipyridine can be rapidly absorbed by plant leaves and reduced to produce dipyridine free radicals by photolysis and respiration that occur in chlorenchyma. Hydroxide and peroxide free radicals are formed by autoxidation of oxygen and hydrogen existing in foliage, which can destroy chlorophyllous membrane to terminate photolysis and chlorophyll synthesis. The treated leaves begin to change color in 2-3 hours. Possible damage can occur to monocotyledon and dicotyledon plants. The application site exhibits remarkable effects with obvious treatment trace but without any conductive effects. When directly released to soil, it is immediately absorbed and inactivated. Weeds may re-vegetate for it has no effects on roots and seeds in soil.

Use & Directions:  

Intended for weed control in fruit and mulberry gardens, rubber and tea plantations. Target crops are rice, wheat, cole and corn. It should be applied prior to seedling. It exhibits no negative effects on young plants and woody plants. The effective concentration is established at 40-60g (i. v) per acre by adding 20-30kg of water for weed removal of the fields after harvest without turnover. For fruit and mulberry gardens, rubber and tea plantations, the effective concentration is established at 40-60g(i.v) by adding 25kg of water. Directional spraying is essential.

Storage: Stored in a cool dry place.

Expiration Period: At least 2 years.

Packaging: Iron or fiber drums. Make adjustments according to   customers' requirements.

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