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Chemical Identification
Common Name
Pyridaphenthion
中文通用名
哒嗪硫磷
IUPAC
O-(1,6-dihydro-6-oxo-1-phenylpyridazin-3-yl) O,O-diethyl phosphorothioate
CAS
O-(1,6-dihydro-6-oxo-1-phenyl-3-pyridazinyl) O,O-diethyl phosphorothioate
CAS No.
119-12-0
Molecular Formula
C14H17N2O4PS
Molecular Structure
Category
Activity
Insecticide, acaricide
Premix
Pyridaphenthion+methomyl+fenvalerate
Pyridaphenthion+fenvalerate
Physical Properties
Molecular weight:340.3; Physical form:Pale yellow solid. Density:1.325 (20 °C); Melting point:54.5-56.0 °C; Vapour pressure:0.00147 mPa (20 °C); Henry constant:5.00 × 10-6 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 3.2; Solubility:In water 100 ppm (20 °C). In acetone 3.77, methanol 2.66 (both in kg/ kg, 21 °C); in diethyl ether 1.01 kg/ kg (25 °C).
Toxicology
Oral:Acute oral LD50 for male rats 769, female rats 850, mice 459, dogs >12 000 mg/ kg. Percutaneous:Acute percutaneous LD50 for male rats 2300, female rats 2100 mg/kg. Non-irritating to skin (rabbits). Inhalation: LC50 (4 h) for rats >1133.3 mg/m3.
Environmental Profile
Ecotoxicology: 
Bees: LD50 0.08 ×g/bee.Birds:Acute oral LD50 for Japanese quail 68 mg/ kg.Daphnia: TLm (3 h) 0.02 mg/l.Fish: TLm (48 h) for carp 12 ppm. 

Environmental fate: 
Animals:In mice and rats, the parent compound, O-ethyl-O-(3-oxo-2-phenyl-2H-pyridazine-6-yl) phosphorothioate and the corresponding phosphate are found.Soil:Soil DT50 11-24 d.Plant:In rice, phenyl maleic hydrazide, O,O-diethyl thiophosphoric acid, and PMH glycoside are formed. WATER SOLUBILITY: 100 ppm at 20°C
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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