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Chemical Identification
Common Name
Metoxuron
中文通用名
甲氧隆
IUPAC
3-(3-chloro-4-methoxyphenyl)-1,1-dimethylurea
CAS
N′-(3-chloro-4-methoxyphenyl)-N,N-dimethylurea
CAS No.
19937-59-8
Molecular Formula
C10H13ClN2O2
Molecular Structure
Physical Properties
Molecular weight:228.7; Physical form:Colourless crystals. Density:Bulk density 0.8 (20 °C); Melting point:126-127 °C; Vapour pressure:4.3 mPa (20 °C); Partition coefficient(n-octanol and water):logP = 1.60.04 (23 °C); Solubility:In water 678 mg/l (24 °C). Soluble in acetone, cyclohexanone, acetonitrile and hot ethanol. Moderately soluble in diethyl ether, benzene, toluene and cold ethanol. Practically insoluble in petroleum ether.; Stability:Stable during storage under normal conditions; stable 4 w at 54 °C. Hydrolysed by strong acids and alkalis; DT50 (50 °C) 18 d ( pH 3), 21 d ( pH 5), 24 d ( pH 7), >30 d ;
Toxicology
(Rat): Oral LD50 3200 mg/kg. Dermal >2000 mg/kg. No significant abnormalities for chicks fed 1250 mg/kg (42 day).Phytotoxicity:Some damage may occur with some varieties of cereal. ADI:0.02 mg/kg b.w.
Environmental Profile
Ecotoxicology:
 Bees:Not toxic to bees; LD50 (oral) 850 ppm.Birds:In 42-d feeding trials, chicks receiving 1250 mg/ kg diet showed no significant abnormalities.Daphnia: LC50 (24 h) 215.6 mg/l.Fish: LC50 (96 h) for rainbow trout 18.9 mg/l.Worms: LC50 for earthworms >1000 mg/ kg soil. 

Environmental fate: 
Soil:In soil, breakdown involves demethylation of the terminal nitrogen, further degradation to 3-chloro-4-methoxyaniline, ring hydroxylation, and ring cleavage. DT50 in soil c. 10-30 d.Plant:Degradation in plants involves demethylation of the terminal nitrogen and hydrolysis of the urea moiety.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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