Atrazine

Appearance white crystal powder. Melting point 175.8 ℃, boiling point 205.0 ℃ (101 kPa), vapor pressure 3.85 × 10-2 mPa (25 ℃), octanol / water partition coefficient Kow logP 2.5 (pH 2, 20 ℃), Henry's constant 1.5 × 10-4 Pa - m3 /mol (calculated value), relative density 1.187, dissociation constant pKa 1.6 (very weak base), flash point Non-flammable. Flash point Non-flammable. Solubility: water 33 mg/L (pH 7, 22 ℃); acetone 31, dichloromethane 28, ethyl acetate 24, ethanol 15, octanol 8.7, toluene 4.0 and hexane 0.11 (g/L, 25 ℃). Stability: Stable for 2 years in unopened original packaging (25±5 °C). Relatively stable in neutral, weakly acidic and weakly alkaline media. Rapidly hydrolyzed to hydroxyl derivatives in strong acids, strong bases or 70 neutral environments. Abiotic hydrolysis, degradation half-life DT50 (25 °C) 33.9 d (pH 5), 365 d (pH 7), 365 d (pH 9).

Preventing and removing annual weeds in spring corn field and summer corn field, the dosage is 1,485~1,755 and 1,215~1,485 g/hm2 soil spray, respectively. To prevent and control annual weeds in rice transplanting field, the dosage is 73.8~98.4 g/hm2 soil method.