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Monosodium methyl arsonate

Names
IUPAC name Sodium hydrogen methylarsonate
Other names Monosodium methyl arsenate; sodium methylarsonate; monosodium methane arsonate; methyl arsonic acid monosodium salt; EPA Pesticide Chemical Code 013803
Identifiers
CAS Number	2163-80-6
3D model (JSmol)	Interactive image
Abbreviations	MSMA
ChemSpider	13732108
ECHA InfoCard	100.016.815
PubChem CID	23664719
CompTox Dashboard (EPA)	DTXSID2025686
InChI InChI=1S/CH5AsO4.Na/c1-6-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-2Key: RDXKFMGONHCKSA-UHFFFAOYSA-L InChI=1/CH5AsO4.Na/c1-6-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-2Key: RDXKFMGONHCKSA-NUQVWONBAT
SMILES .()(=O)OC
Properties
Chemical formula	CH4AsNaO3
Molar mass	161.95 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

Monosodium methyl arsenate (MSMA) is an arsenic-based herbicide and fungicide. It is an organic arsenate; but it is a less toxic organic form of arsenic, which has replaced the role of lead hydrogen arsenate in agriculture. It is one of the most common herbicides used on golf courses. It is typically used for control of grassy weeds such as crabgrass. Another common use is for burning the marked lines into grassy sports fields.

Some of its trade names include Ansar 170, Ansar 170L, Ansar 529, Ansar 529 HC, Ansar 6.6, Asazol, Bueno, Bueno 6, CCRIS 4676, Caswell No. 582, Daconate, Daconate 6, Dal-E-Rad, Dal-E-Rad 120, Drexar, Gepiron, HSDB 754, Herb-All, Herban M, Merge, Merge 823, Mesamate, Mesamate H.C., Mesamate-400, and Mesamate-600.

See also

• Cacodylic acid
• Disodium methyl arsenate

References

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• The MAA Research Task Force (MAATF)
• Case Studies in Environmental Medicine - Arsenic Toxicity
• NLM Hazardous Substances Databank – Sodium methanarsenate

• Arsenates
• Organoarsenic compounds
• Sodium compounds
• Arsenical herbicides
• Fungicides