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{{short description|Arsenic-based herbicide}}
{{More citations needed|date=February 2018}}
{{chembox {{chembox
| Verifiedfields = changed
| Watchedfields = changed | Watchedfields = changed
| verifiedrevid = 400311912 | verifiedrevid = 441175565
|ImageFile=Monosodium_methyl_arsenate.png | ImageFile=Monosodium_methyl_arsenate.png
|ImageSize=150px | ImageSize=150px
| ImageAlt = Skeletal formula of monosodium methyl arsenate
⚫ |IUPACName=Sodium hydrogen methylarsonate
| ImageFile1 = Monosodium-methyl-arsenate-3D-balls.png
⚫ |OtherNames=Monosodium methyl arsenate; sodium methylarsonate; monosodium methane arsonate; methyl arsonic acid monosodium salt; EPA Pesticide Chemical Code 013803
| ImageAlt1 = Ball-and-stick model of the monosodium methyl arsenate molecule
⚫ | IUPACName=Sodium hydrogen methylarsonate
⚫ | OtherNames=Monosodium methyl arsenate; sodium methylarsonate; monosodium methane arsonate; methyl arsonic acid monosodium salt; EPA Pesticide Chemical Code 013803
|Section1={{Chembox Identifiers |Section1={{Chembox Identifiers
| Abbreviations = MSMA | Abbreviations = MSMA
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}
| ChemSpiderID = 13732108 | ChemSpiderID = 15697
⚫ | SMILES = C(=O)(O).
| InChI = 1/CH5AsO4.Na/c1-6-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-2 | InChI = 1/CH5AsO3.Na/c1-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-1
| InChIKey = RDXKFMGONHCKSA-NUQVWONBAT
| InChIKey = JITOKQVGRJSHHA-REWHXWOFAY
| StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI_Ref = {{stdinchicite|changed|chemspider}}
| StdInChI = 1S/CH5AsO4.Na/c1-6-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-2 | StdInChI = 1S/CH5AsO3.Na/c1-2(3,4)5;/h1H3,(H2,3,4,5);/q;+1/p-1
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}
| StdInChIKey = RDXKFMGONHCKSA-UHFFFAOYSA-L | StdInChIKey = JITOKQVGRJSHHA-UHFFFAOYSA-M
| CASNo_Ref = {{cascite|correct|CAS}} | CASNo_Ref = {{cascite|correct|CAS}}
| CASNo=2163-80-6 | CASNo=2163-80-6
| UNII_Ref = {{fdacite|correct|FDA}}
⚫ | PubChem=23664719
| UNII = 600QCW45IV
⚫ | SMILES = .()(=O)OC
⚫ | PubChem=23664719
}} }}
|Section2={{Chembox Properties |Section2={{Chembox Properties
| Formula=CH<sub>4</sub>AsNaO<sub>3</sub> | Formula=CH<sub>4</sub>AsNaO<sub>3</sub>
| MolarMass=161.95 g/mol | MolarMass=161.95 g/mol
| Appearance= | Appearance=
| Density= | Density=
| MeltingPt= | MeltingPt=
| BoilingPt= | BoilingPt=
| Solubility= | Solubility=
}} }}
|Section3={{Chembox Hazards |Section3={{Chembox Hazards
| MainHazards= | MainHazards=
| FlashPt= | FlashPt=
| AutoignitionPt =
| Autoignition=
}} }}
}} }}


'''Monosodium methyl arsenate''' (MSMA) is an ]-based ]. 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.<ref name="EPA1">{{cite web |url=https://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.highlight/abstract/6015 |title=Biogeochemistry of Arsenic in Contaminated Soils of Superfund Sites |last1=Dibyendu |first1=Sarkar |last2=Datta |first2=Rupali |date=2007 |website=EPA |publisher=United States Environmental Protection Agency |access-date=25 February 2018 }}</ref>
'''Monosodium methyl arsenate''' (MSMA) is an ]-based ] and ]. It is an organic ]; but it is a less toxic organic form of ], which has replaced the role of ] in ]. It is one of the most common herbicides used on ]s. 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.


Arsenic is classified as a Group-A ].<ref name="EPA1"/> The EPA states that:<ref>{{cite web |url=https://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.highlight/abstract/6015/report/F |title=Final Report: Biogeochemistry of Arsenic in Contaminated Soils of Superfund Sites |last=Carelton |first=James |date=2007 |website=EPA |publisher=United States Environmental Protection Agency |access-date=25 February 2018 }}</ref>
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.
{{blockquote|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:
==See also==
{{div col|colwidth=22em}}
*Target 6 Plus
*Target 6.6
*MSMA 6 Plus
*MSMA 6.6


{{div col end}}
* ]
* ]


== References== ==References==
{{refstyle}}
{{reflist}}


*{{cite web | last=Agency for Toxic Substances & Disease Registry | title=Arsenic Toxicity Case Study | work=Environmental Health and Medicine Education | access-date=25 December 2013 | url=https://www.atsdr.cdc.gov/csem/csem.html}}
*
*{{cite web | author=MAA Research Task Force | title=Organic Arsenical Products Task Force | url=http://www.maatf.com/index.html}}
*
* *{{cite web | author=National Library of Medicine | title=Sodium Methanearsonate | work=HSDB Database | url=http://toxnet.nlm.nih.gov/cgi-bin/sis/search/r?dbs+hsdb:@term+@rn+@rel+2163-80-6}}

;Specific
<references />


{{Herbicides}} {{Herbicides}}


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