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)

Porduct NewsMore

2-Bromoheptafluoropropane: A Key Intermediate of Broflanilide, a Meta-Diamide Insecticide with Huge Commercial Potential

broflanilide

AlgaPure seaweed extract flakes help farmer grow yield

Biostimulants

Pesticides terbufos and iprodione to be recommended for Rotterdam listing

Terbufos Iprodione

Argentina starts producing Rynaxypyr locally

Chlorantraniliprole

Chitosan Oligosaccharide:Zhongke Runyao to explore ways to industrialize research achievements on virus and cold resistant

Biostimulants

Gliforte, a unique glyphosate product with lower impact on environment

Glyphosate

MSU Licenses Technology to Adjuvants Plus Inc.

2,4-D

Amicarbazone is the active ingredient indicated for sugarcane in Brazil, points out UPL Brasil

Amicarbazone

Syngenta Portugal presents Camix herbicide

S-metolachlor Mesotrione

New president of Aprosoja Brazil says it is “better not to use dicamba”

Dicamba

Related CompaniesMore