Ethephon

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Ethephon

中文通用名

乙烯利

IUPAC

2-chloroethylphosphonic acid

CAS

(2-chloroethyl)phosphonic acid

CAS No.

16672-87-0

Molecular Formula

C₂H₆ClO₃P

Molecular Structure

General Product Information

Category

Plant growth regulators > Ethylene releasers
Plant growth regulators > Defoliants

Activity

Plant Growth Regulator

Premix

Diethyl aminoethyl hexanoate+Ethephon
Diuron+Thidiazuron+Ethephon
6-benzylamino-purine+Ethephon
Thidiazuron+Ethephon
Aqueous solution, liquid concentrate.
Premix Parters: cypermethrin; tetradifon;

Physical & Safety Data

Physical Properties

Molecular weight:144.5; Physical form:Colourless solid; ( tech. is a clear liquid). Density:1.409.02 (20 °C) ( tech.); Melting point:74-75 °C; Vapour pressure:<0.01 mPa (20 °C); Henry constant:<1.55 × 10-9 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP <-2.20 (25 °C, unstated pH); pKa: pKa1 2.5, pKa2 7.2; Solubility:In water c. 1 kg/l (23 °C). Readily soluble in methanol, ethanol, isopropanol, acetone, diethyl ether, and other polar organic solvents. Sparingly soluble in non-polar organic solvents such as benzene and toluene. Insoluble in ke; Stability:Stable in aqueous solutions having pH <5. At higher pH, decomposition occurs with the liberation of ethylene. Sensitive to u.v. irradiation.;

Toxicology

Oral:Acute oral LD₅₀ for rats 3030 mg/ kg ( tech.). Percutaneous:Acute percutaneous LD₅₀ for rabbits 1560 mg/ kg ( tech.). Irritating to skin and eyes. Inhalation: LC₅₀ (4 h) for rats 6.26 mg/l ( tech.).

Environmental Profile

Ecotoxicology:
Algae: EC₅₀ (24-48 h) for Chlorella vulgaris 32 mg/l.Bees:Not toxic to bees.Birds:Acute oral LD₅₀ for bobwhite quail 1072 mg/50 (8 d) for bobwhite quail >7000 ppm in diet (tech.50 (48 h) 577.4 mg/l.Fish: LC₅₀(96 h) for carp >140, rainbow trout 720 mg/l ( tech.).Worms:Not toxic to earthworms.Other aquatic spp.:Low toxicity.

Environmental fate:
Animals:In animals, ethephon is rapidly excreted intact via the urine, and as ethylene via the expired air.Soil:Rapidly degraded in soil, and strongly adsorbed; unlikely to leach.Plant:In plants, ethephon rapidly undergoes degradation to ethylene."

Transport Information

Signal Word:DANGER; Hazard Class:Ib(Highly hazardous)