Metazachlor

Metazachlor

吡唑草胺

2-chloro-N-(pyrazol-1-ylmethyl)acet-2′,6′-xylidide

2-chloro-N-(2,6-dimethylphenyl)-N-(1H-pyrazol-1-ylmethyl)acetamide

67129-08-2

C₁₄H₁₆ClN₃O

Herbicides > Pyrazole herbicides
Herbicides > Anilide herbicides
Herbicides > Amide herbicides

Herbicide

Suspension concentrate. 
Premix Parters: chlorpyrifos; diflubenzuron; endosulfan; pheromone;

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.;

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.

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

Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)