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Chemical Identification
Common Name
Butralin
中文通用名
仲丁灵
IUPAC
(RS)-N-sec-butyl-4-tert-butyl-2,6-dinitroaniline
CAS
4-(1,1-dimethylethyl)-N-(1-methylpropyl)-2,6-dinitrobenzenamine
CAS No.
33629-47-9
Molecular Formula
C14H21N3O4
Molecular Structure
Category
Activity
Herbicide, plant growth regulator
Premix
Butralin+Diuron
Mesotrione+Butralin
Bensulfuron-methyl+Butralin
Oxadiazon+Butralin
Emulsifiable concentrate. Premix Parters: MSMA sodium cacodylate; sodium cacodylate;
Physical Properties
Molecular weight:295.3; Physical form:Yellow-orange crystals with a slightly aromatic odour. Density:1.063 (25 °C); Composition:Tech. is ×98%. Melting point:61 °C; ( tech., 59 °C); Vapour pressure:0.77 mPa (25 °C); Henry constant:7.58 × 10-1 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 4.93; Solubility:In water 0.3 mg/l (25 °C). In methanol 97.5, hexane 300 (both in g/l, 25 °C).; Stability:Decomposes at 265 °C. Hydrolytically and photochemically stable. Concentrates are stable on storage under dry conditions >3 y, but should not be stored <-5 °C or allowed to freeze.;
Toxicology
Oral:Acute oral LD50 for male rats 1170, female rats 1049 mg/kg( tech.). Percutaneous:Acute percutaneous LD50 ( tech.) for rabbits ×2000 mg/kg. Slightly irritating to skin, moderately irritating to eyes (rabbits). Moderate skin sensitiser (Kligman & Magnusson test); not Inhalation: LC50 for rats >9.35 mg/l air.
Environmental Profile
Ecotoxicology: 
Algae: EC50 (5 d) for Selenastrum capricornutum 0.12 mg/l.Bees:Slightly toxic to bees.Birds:Acute oral LD50 for bobwhite quail >>2250, Japanese quail >>5000 mg/kg. Dietary LC50 (8 d) for bobwhite quail and mallard ducks >10 000 mg/kg diet.Daphnia: EC50 (48 h) 0.12 mg/l.Fish:LC50 (96 h) for bluegill sunfish 1.0, rainbow trout 0.37 mg/l.Other beneficial spp.:Not toxic to soil microflora at usual application rate. Application at 2-10 ×recommended rate did not significantly alter microbial population. 

Environmental fate: 
Animals:Extensively metabolised and excreted in urine and faeces. Metabolised in the rat by the primary metabolic processes of N-dealkylation, oxidation and nitro reduction, and by secondary processes of N-acetyl and glucuronic acid conjugation.Soil:In soil, microbial degradation occurs, with formation of the corresponding aniline, ring splitting and evolution of CO2 (P. C. Kearney et al., J. Agric. Food Chem., 1974, 22, 856). Persists in soil forPlant:In plants, metabolism leads to evolution of CO2.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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