Monosodium methyl arsonate

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	15697 ;
ECHA InfoCard	100.016.815
PubChem CID	23664719;
UNII	600QCW45IV ;
CompTox Dashboard (EPA)	DTXSID2025686 ;
	InChI InChI=1S/CH5AsO3.Na/c1-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-1 Key: JITOKQVGRJSHHA-UHFFFAOYSA-M ; InChI=1/CH5AsO3.Na/c1-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-1 Key: JITOKQVGRJSHHA-REWHXWOFAY;
	SMILES C[As](=O)(O)[O-].[Na+];
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 [77 °F], 100 kPa). verify (what is ?) Infobox references

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]

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

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

[EPA1-1] 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.

[1]

[2]