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

EPA Pesticide Chemical Search

Exposure Assessment
PEL (OSHA)

0.5 mg/m3, as As

Vapor Pressure

7.5E-8 mm Hg

Lethal Concentration

LC50 (rat) > 2,200 mg/m3

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Biomedical References

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: