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Chemical Identification
Common Name
DSMA
中文通用名
甲基胂酸二钠
IUPAC
disodium methylarsonate
CAS
disodium methylarsonate
CAS No.
144-21-8
Molecular Formula
CH3AsNa2O3
Molecular Structure
Physical Properties
Molecular weight:183.9. Physical form:Colourless crystals (hexahydrate). Composition:DSMA forms a hexahydrate. Melting point:132-139 °C; Solubility:In water 279 g/ kg (anhydrous salt) (20 °C). Soluble in methanol, but practically insoluble in most organic solvents. Stability:Loses water at elevated temperatures. Hydrolysed to MSMA at pH 6-7. Decomposed by strong oxidising and reducing agents. DSMA 81SP*: White crystalline solid. Melting point 300°C. Dry DSMA (63SP)*: Hexahydrate is stable form in moist air. Solubility: 26 g/100 ml in methanol; 0.0025 g/100 ml in hexane.
Toxicology
Oral:Acute oral LD50 for young albino rats 1800 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits 10 000 mg/kg. Mild irritant to skin and eyes (rabbits).
Environmental Profile
WATER SOLUBILITY: 34.1 g/100 ml at 25°C. Log Kow is <1.
Transport Information
Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)

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