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| Names | |
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IUPAC name
Sodium hydrogen methylarsonate
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| Other names
Monosodium methyl arsenate; sodium methylarsonate; monosodium methane arsonate; methyl arsonic acid monosodium salt; EPA Pesticide Chemical Code 013803
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| Identifiers | |
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3D model (JSmol)
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| Abbreviations | MSMA |
| ChemSpider | |
| ECHA InfoCard | 100.016.815 |
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PubChem CID
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| UNII | |
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CompTox Dashboard (EPA)
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| Properties | |
| CH4AsNaO3 | |
| Molar mass | 161.95 g/mol |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Monosodium methyl arsenate (MSMA) is an arsenic-based herbicide. It is an organo-arsenate; less toxic than the inorganic form of arsenates. However, the EPA states that all forms of arsenic are a serious risk to human health and the United States' Agency for Toxic Substances and Disease Registry ranked arsenic as number 1 in its 2001 Priority List of Hazardous Substances at Superfund sites.
Arsenic is classified as a Group-A carcinogen. The EPA states that:
Arsenate (AsV) is the oxidized form and occurs in well-aerated soils, whereas in chemically-reduced soil environments, arsenite (AsIII) is the prevalent As form. Although arsenite is more toxic than arsenate, arsenate can also have deleterious effects on humans, plants, and microorganisms. Arsenic-contaminated soils pose serious risk to human health. The EPA also states that, while contaminated soil poses a serious risk to health, arsenic frequently mobilizes from soils and other sources, ending up in water where it is even more of a toxicity issue.
Trade names include:
- Target 6 Plus
- Target 6.6
- MSMA 6 Plus
- MSMA 6.6
- Agency for Toxic Substances & Disease Registry. "Arsenic Toxicity Case Study". Environmental Health and Medicine Education. Retrieved 25 December 2013.
- MAA Research Task Force. "Organic Arsenical Products Task Force".
- National Library of Medicine. "Sodium Methanearsonate". HSDB Database.
- Specific