Monosodium methanearsonate
Agent Name
Monosodium methanearsonate
Alternative Name
MSMA
CAS Number
2163-80-6
Formula
C-H4-As-O3.Na
Major Category
Metals
Synonyms
MSMA; Ansar 170; Ansar 170L; Ansar 529; Ansar 529 HC; Ansar 6.6; Arsonic acid, methyl-, monosodium salt; Asazol; Bueno; Bueno 6; Daconate; Daconate 6; Dal-E-Rad; Dal-E-Rad 120; Drexar; Gepiron; Herb-All; Herban M; MSMA; Merge; Merge 823; Mesamate; Mesamate H.C.; Mesamate concentrate; Mesamate-400; Mesamate-600; Methanearsonic acid, monosodium salt; Methylarsonat monosodny [Czech]; Methylarsonic acid, sodium salt; Monate; Monex; Monoban; Monomethylarsonic acid sodium salt; Monosodium acid methanearsonate; Monosodium acid metharsonate; Monosodium methanearsonate; Monosodium methanearsonic acid; Monosodium methylarsonate; Phyban; Phyban H.C.; Silvisar 550; Sodium acid methanearsonate; Sodium hydrogen methylarsonate; Sodium methylarsonate; Super Arsonate; Target MSMA; Trans-Vert; Weed 108; Weed-HOE-108; [ChemIDplus]
Category
Arsenic Compounds, Organic
Description
White solid; [Hawley] Colorless odorless solid; [CAMEO]
Sources/Uses
Used as post-emergence herbicide for turf, cotton, and non-cropland; [HSDB]
Comments
A skin and eye irritant; [HSDB] Most excreted unchanged; [Rosenstock, p. 947] For MSMA and DSMA, developmental studies of rats and rabbits along with a two-generation reproductive study show no indication of increased susceptibility; No evidence of carcinogenicity; Target organs are large intestines and kidneys; [Reference #1]
Reference Link #1
Biomedical References
Exposure Assessment
PEL (OSHA)
0.5 mg/m3, as As
Vapor Pressure
7.5E-08 mm Hg
Lethal Concentration
LC50 (rat) > 2,200 mg/m3
Diseases, Processes, and Activities Linked to This Agent
Processes
Industrial Processes with risk of exposure: