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Chemical Identification
Common Name
Linuron
中文通用名
利谷隆
IUPAC
3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea
CAS
N'-(3,4-dichlorophenyl)-N-methoxy-N-methylurea
CAS No.
330-55-2
Molecular Formula
C9H10Cl2N2O2
Molecular Structure
Category
Activity
Herbicide
Premix
Dry flowable, flowable, water dispersible granule, wettable powder.
Premix Parters: cyfluthrin; lambda-cyhalothrin; lambda-cyhalothrin imidacloprid; deltamethrin; methomyl; permethrin; pyrethrins; spinosad; sulfur;
Physical Properties
Molecular weight:249.1g/mol; Physical form:Colourless crystals. Density:1.49 (20 ℃); Composition:Tech. is >94% pure. Melting point:93-95 ℃; Vapour pressure:0.051 mPa (20 ℃); 7.1 mPa (50℃) (EC method); Henry constant:2.0 × 10-4 Pa m3 mol-1 (20 ℃); Partition coefficient(n-octanol and water):logP = 3.00; Solubility:In water 63.8 mg/l (20℃, pH 7). In acetone 500, benzene, ethanol 150, xylene 130 (all in g/ kg, 25 ℃). Readily soluble in dimethylformamide, chloroform, and diethyl ether. Moderately soluble in aromatic; Stability:Stable at m.p. and in aqueous solution at pH 5, 7 & 9; DT50 945 d at all three values.
Toxicology
Oral:Acute oral LD50 for rats 1500-4000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Mild skin irritant (rabbits); not a skin sensitiser (guinea pigs). Inhalation: LC50 (4 h) for rats >6.15 mg/l air.
Environmental Profile
Ecotoxicology:
Bees: LD50 (oral) >1600 μg/g bee b.w.Birds:Acute oral LD50 for bobwhite quail 940 mg/kg. Dietary LC50 (8 d) for mallard ducklings 3083 ppm, >5000 mg/ kg (values from separate Daphnia: LC50 (48 h) 0.75 mg/l, 0.12 mg/l (separate studies).Fish: LC50 (96 h) for rainbow trout 3.15, sheepshead minnow 0.89 mg/l; NOEC 0.49 mg/l.Worms: LC50 for Eisenia foetida >1000 mg/ kg soil.Other aquatic spp.: LC50 (96 h) for mysid shrimp (Mysidopsis bahia) 3.4 mg/l; NOEC 2.1 mg/l.Other beneficial spp.:Harmless to other beneficial arthropods.

Environmental fate:
Animals:The major metabolites arise from demethylation and demethoxylation.Soil:Microbial degradation is the primary factor in disappearance from soil. Half-life under field conditions is c. 2-5 mo (F. Kempson-Jones & R. J. Hance, Pestic. Sci., 1979, 10, 449). Plant:In plants, metabolism involves demethylation and demethoxylatio
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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