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| 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 | |
3D model (JSmol) | |
| Abbreviations | MSMA |
| ChemSpider |
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| ECHA InfoCard | 100.016.815 |
| UNII | |
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| Properties | |
| CH4AsNaO3 | |
| Molar mass | 161.95 g/mol |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Monosodium methyl arsenate (MSMA) is anarsenic-basedherbicide. 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.[1]
Arsenic is classified as a Group-Acarcinogen.[1] The EPA states that:[2]
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:
