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Chemical Identification
Common Name
MCPA-thioethyl
中文通用名
2甲4氯硫代乙酯
IUPAC
S-ethyl 4-chloro-o-tolyloxythioacetate
CAS
S-ethyl (4-chloro-2-methylphenoxy)ethanethioate
CAS No.
25319-90-8
Molecular Formula
C11H13ClO2S
Molecular Structure
Physical Properties
Molecular weight:244.7; Physical form:White needle crystals; ( tech., brown crystals). Composition:Tech. grade is 92% pure. Melting point:41-42 °C; Vapour pressure:21 mPa (20 °C); Partition coefficient(n-octanol and water):logP = 4.05; Solubility:In water 2.3 mg/l (25 °C). In acetone, xylene >1000, hexane 290 (all in g/l, 25 °C).; Stability:Stable in acidic media, but comparatively unstable in alkaline media. In water, DT50 (25 °C) 22 d ( pH 7), 2 d ( pH 9). Stable below 200 °C.;
Toxicology
Oral:Acute oral LD50for male rats 790, female rats 877, male mice 811, female mice 749 mg/ kg. Percutaneous:Acute percutaneous LD50 for male mice >1500 mg/kg. Application (24 h) of tech. to skin and eyes of rabbits produced no irritation. Inhalation: LC50 (4 h) for rats >44 mg/m3.
Environmental Profile
Ecotoxicology: Bees:LD50 (contact) >40 mg/bee.Birds:Acute oral LD50 for Japanese quail >3000 mg/ kg.Daphnia: LC50 (6 h) 4.5 mg/l.Fish: LC50 (48 h) for carp 2.5 mg/l.
Transport Information
Hazard Class:III(Slightly hazardous)

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