Monosodium methyl arsonate

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.[1]

Monosodium methyl arsonate
Skeletal formula of monosodium methyl arsenate
Ball-and-stick model of the monosodium methyl arsenate molecule
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
ECHA InfoCard 100.016.815
UNII
  • InChI=1S/CH5AsO3.Na/c1-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-1 ☒N
    Key: JITOKQVGRJSHHA-UHFFFAOYSA-M ☒N
  • InChI=1/CH5AsO3.Na/c1-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-1
    Key: JITOKQVGRJSHHA-REWHXWOFAY
  • C[As](=O)(O)[O-].[Na+]
Properties
CH4AsNaO3
Molar mass 161.95 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Arsenic is classified as a Group-A carcinogen.[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:

  • Target 6 Plus
  • Target 6.6
  • MSMA 6 Plus
  • MSMA 6.6

References
  • 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
  1. Dibyendu, Sarkar; Datta, Rupali (2007). "Biogeochemistry of Arsenic in Contaminated Soils of Superfund Sites". EPA. United States Environmental Protection Agency. Retrieved 25 February 2018.
  2. Carelton, James (2007). "Final Report: Biogeochemistry of Arsenic in Contaminated Soils of Superfund Sites". EPA. United States Environmental Protection Agency. Retrieved 25 February 2018.
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