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Chemical Identification
Common Name
MSMA
中文通用名
甲基砷酸钠
IUPAC
sodium hydrogen methylarsonate
CAS
monosodium methylarsonate
CAS No.
[2163-80-6]
Molecular Formula
CH4AsNaO3
Molecular Structure
Category
Activity
Herbicide
Premix
Liquid, liquid plus surfactants, soluble granules. 
Premix Parters: cypermethrin; malathion; methyl eugenol methylene chloride;
Physical Properties
Molecular weight:162.0; Physical form:Colourless crystals (hydrate); (, clear light yellow liquid). Density:1.535 g/ml (25 °C); Composition:MSMA forms a sesquihydrate. Tech. material is 51% MSMA. Melting point:113-116 °C (sesquihydrate); Vapour pressure:1 × 10-2 (25 °C); Partition coefficient(n-octanol and water):logP <0; pKa:9.02; Solubility:In water 1.4 / (anhydrous salt) (20 °C). Soluble in methanol; insoluble in most organic solvents.; Stability:Stable to hydrolysis. Decomposed by strong oxidising and reducing agents.; Tech: clear light yellow liquid; practically odorless. Boiling point >100°C.
Toxicology
Oral:Acute oral 50 for young albino rats 900 /. Percutaneous:Mild irritant to skin and eyes (rabbits). Inhalation:50 (4 h) >20 /l.
Environmental Profile
Ecotoxicology:
 Algae:(for 51% MSMA) 50 (5 d) for Selenastrum 7.6 /l.Bees:50 68 mg/bee; 36 mg/bee.Birds:50 for quail 425.2 g/kg. Dietary 50 (5 d) for quail 1667, mallard ducks >2866 .Daphnia:50 (48 h) 77.5 /l.Fish:50 (96 h) for bluegill sunfish >51, trout >167 /l. for bluegill sunfish 93.2, trout 167 /l.Other aquatic spp.:(for 51% MSMA) EC25 (14 d) for Lemna gibba 107.3 /l; 50 (14 d) 145.9 /l. 

Environmental fate: 
Soil:Terrestrial dissipation, 50 55 d, 50 for cacodylic acid (primary metabolite) 88 d. MSMA and cacodylic acid are found primarily in upper 6 inches of soil. oc 250 (sandy
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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