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Chemical Identification
Common Name
Dalapon
中文通用名
茅草枯
IUPAC
2,2-dichloropropionic acid
CAS
2,2-dichloropropanoic acid
CAS No.
75-99-0
Molecular Formula
C3H4Cl2O2
Molecular Structure
Category
Activity
Herbicide
Premix
Water soluble powder. Premix Parters: maleic hydrazide.
Physical Properties
Acid itself not used directly. Commercial products usually sodium salt or mixed sodium + magnesium salts of dalapon. Sodium salt: yellowish, solid. Molecular weight:143.0; Physical form:Colourless liquid. Vapour pressure:0.01 mPa (20 °C); pKa:1.74-1.84, depending on the ionic strength of the solution.; Stability:Subject to hydrolysis; slight at 25 °C, but comparatively rapid 50 °C; so aqueous solutions should not be kept for any length of time. Alkali causes dehydrochlorination above 120 °C.
Toxicology
Sodium 2,2-dichloropropionic acid: (Rat): Oral LD50 9330 mg/kg (male); 7570 mg/kg (female). ADI:0.3 mg/kg.
Environmental Profile
Ecotoxicology:
Fish: LC50 105 ppm (bluegill). Bird: Dietary LC50 >5000 ppm (mallard, ring-necked pheasant, Japanese quail). 
Environmental fate: Animals:In mammals, following oral administration, dalapon is rapidly eliminated. In dogs, following a single oral dose of 500 mg, 65-70% is excreted within 2 hours.Soil:In soil, readily undergoes microbial degradation involving dechlorination and liberation of CO2 (B. E. Day et al., Soil Sci., 1963, 95, 326). Plant:In plants, dalapon-sodium does not undergo significant degradation.
WATER SOLUBILITY: 629 g/kg at 25° C
Transport Information
Signal Word:WARNING; Hazard Class:II (Moderately hazardous)

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