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Chemical Identification
Common Name
Metazachlor
中文通用名
吡唑草胺
IUPAC
2-chloro-N-(pyrazol-1-ylmethyl)acet-2′,6′-xylidide
CAS
2-chloro-N-(2,6-dimethylphenyl)-N-(1H-pyrazol-1-ylmethyl)acetamide
CAS No.
67129-08-2
Molecular Formula
C14H16ClN3O
Molecular Structure
Category
Activity
Herbicide
Premix
Suspension concentrate. 
Premix Parters: chlorpyrifos; diflubenzuron; endosulfan; pheromone;
Physical Properties
Molecular weight:277.8; Physical form:Yellowish crystals; ( tech., beige solid). Density:c. 1.31 (20 °C); Composition:Tech. is 94% pure. Melting point:c. 85 °C; Vapour pressure:0.093 mPa (20 °C); Henry constant:5.741 × 10-5 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 2.13 (pH 7, 22 °C).; Solubility:In water 430 mg/l (20 °C). In acetone, chloroform >1000, ethyl acetate 590, ethanol 200 (all in g/ kg, 20 °C).; Stability:Stable for at least 2 years at up to 40 °C.;
Toxicology
Oral:Acute oral LD50 for rats 2150 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >6810 mg/kg. No irritation of mucous membranes (rabbits). Inhalation: LC50 (4 h) for rats >34.5 mg/l.
Environmental Profile
Ecotoxicology: Algae: EC50 (96 h) for green algae (Chlorella fusca) 1.63 mg/l.Bees:Not toxic to bees; highest concentration tested 3.6%.Birds:Acute oral 50 for bobwhite quail >2000 mg/kg. LC50 for bobwhite quail and mallard ducks >5620 mg/ kg b.w.Daphnia: LC50 (48 h) 22 mg/l.Fish: LC50 (96 h) for rainbow trout 4, carp 15 mg/l.Worms: LC50 (14 d) 440 mg/ kg soil.Other aquatic spp.: NOEC for nine tested species of higher aquatic and marsh plants is 5 mg/l. Environmental fate: Animals:In rats, after oral administration, the a.i. was well resorbed, vigorously metabolised and eliminated mainly and rapidly via the kidneys in the form of polar conjugates (mainly glucuronides). The metabolism of the phase 1 reactions consistsSoil:Laboratory and field trials indicate that microbial degradation in aerobic soil is rapid; DT50 (lab.) 1-23 d; DT50 in soils fresh from the field 77 d, soil temperatures down to 10 °C. In fiePlant:After pre-emergence application, the 14C-phenyl labelled active ingredient was taken up by oilseed rape plants (0.55 mg/ kg 36 days after sowing and 0.43 mg/ kg, day 78). WATER SOLUBILITY: 430 mg/l at 20° C
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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