Methylarsonic acid |
![]() Last updated: 04/01/2021 |
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(Also known as: MAA; methane arsonic acid; monomethylarsonic acid ; methylarsinic acid) |
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A largely obsolete herbicide that was used on turf to control paspalum and summer grass | |
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Grass weeds | |
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Turf | |
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Obsolete | |
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1994 |
UK regulatory status |
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Not approved | ||
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Not applicable | ||
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No UK approval for use |
EC Regulation 1107/2009 (repealing 91/414) |
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Not applicable | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Also used in |
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Chemical structure |
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CH₅AsO₃ | |
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C[As](=O)(O)O | |
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No data | |
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QYPPRTNMGCREIM-UHFFFAOYSA-N | |
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InChI=1S/CH5AsO3/c1-2(3,4)5/h1H3,(H2,3,4,5) | |
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Yes |
General status |
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Herbicide | |
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Organometal | |
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Synthetic | |
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Selective, contact action with some systemic properties. Readily absorbed by leaves and translocates throughout the plant | |
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124-58-3 | |
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204-705-6 | |
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128876 | |
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8948 | |
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139.97 | |
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methylarsonic acid | |
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methylarsonic acid | |
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Not known | |
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Not known | |
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Not applicable | |
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Not applicable | |
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White hydroscopic crystals |
Formulations |
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Usually formulated as a soluble concentrate |
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2.56E+05 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
High | ||||||||
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161 | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known source |
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6.61 X 10-02 | Calculated | - | |||||||
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-1.18 | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known source |
Low | ||||||||
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4.1 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
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Strong dibasic acid | |||||||||||
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215.97 | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known source |
Highly volatile | ||||||||
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Degradation |
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Soil adsorption and mobility |
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Fate indices |
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Low risk | Q3 Q = Miscellaneous internet resources Based on LogP < 33 = Unverified data of known source |
Low risk | |||||||
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2833 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
Low | ||||||||
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> 425 | L3 L = Pesticide manuals and hard copy reference books / other sources Colinus virginianus3 = Unverified data of known source |
Moderate | ||||||||
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77.5 | L3 L = Pesticide manuals and hard copy reference books / other sources Daphnia magna3 = Unverified data of known source |
Moderate | ||||||||
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68.0 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
Moderate | |||||||
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General |
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High (class III) | - | - | ||||||||
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2833 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
Low | ||||||||
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2.2 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat 4 hr3 = Unverified data of known source |
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Health issues |
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May cause abdominal pain, diarrhoea and vomiting if ingested Possible kidney and liver toxicant IARC group 2B carcinogen |
Handling issues |
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Emits toxic and irritating fumes in a fire | |||
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T - Toxic: R23, R25 N - Dangerous for the environment: R50/53 |
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S1/2, S20/21, S28, S45, S60, S61 | |||
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III (Slightly hazardous) | |||
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methylarsonic acid | ||
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Record last updated: | 04/01/2021 |
Contact: | aeru@herts.ac.uk |
Please cite as: | Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242 |