Pendimethalin is a selective herbicide used to control most annual grasses and certain broadleaf weeds in field corn, potatoes, rice, cotton, soybeans, tobacco, peanuts and sunflowers. It is used both preemergence, that is before weed seeds have sprouted, and early postemergence. Incorporated into the soil by cultivation or irrigation is recommended within 7 days following application. Pendimethalin is available as emulsifiable concentrate, wettable powder or dispersible granule formulations.
Physical Properties:
Specific gravity: 1.17 g/ml at 25 ℃
H20 solubility: 0.275 ppm at 25 ℃; 300 ppb at 20 ℃
Solubility in other solvents: soluble in most organic solvents such as acetone (161.0 g/100 ml at 25 ℃) and xylene. Soluble in corn oil, heptane, benzene, toluene, chloroform, dichloromethane.
Moderately soluble in isopropanol.
Slightly soluble in petroleum ether and petrol .
Melting point: Melting starts at 47-53 ℃, and samples are completely melted at 56-58 ℃.
Boiling point: 330 ℃
Flashpoint: 92 ℃
Vapor pressure: negligible; 3.0 x 10 to the minus 5 mm Hg at 25 ℃
Koc: 24,300 g/ml
Chemical Class/Use: dinitroaniline herbicide
PADI: 0.125 mg/kg/day