Calcium acid methanearsonate |
![]() Last updated: 04/01/2021 |
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(Also known as: methanearsonic acid, calcium salt ; CAMSA; CAMA; calcium hydrogen methanearsonate ) |
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An arsenical herbicide used for post-emergence weed control mainly on turf | |
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Crabgrass; Stiltgrass; Barnyardgrass; Goosegrass | |
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Turfgrass; Ornamental turf; Turf grown for sod; Golf courses and sports turf; Cotton; Roads and rights-of-way | |
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Obsolete | |
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1960s |
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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Also used in |
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Chemical structure |
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C₂H₈As₂CaO₆ | |
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C[As](=O)([O-])[O-].C[As](=O)([O-])[O-].[Ca+2] | |
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No data | |
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PKOMXLRKGNITKG-UHFFFAOYSA-J | |
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InChI=1S/2CH5AsO3.Ca/c2*1-2(3,4)5;/h2*1H3,(H2,3,4,5);/q;;+2/p-4 | |
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Yes |
General status |
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Herbicide | |
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Arsenical compound | |
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Synthetic | |
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Interferes with ATP production and cell division | |
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5902-95-4 | |
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227-598-8 | |
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013806 | |
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22193 | |
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318.0 | |
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calcium methyl-dioxido-oxo-γ5-arsane | |
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PAN Bad Actor; Possible groundwater contaminant | |
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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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Solid |
Formulations |
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Usually formulated as liquid concentrates and ready-to-use solutions |
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860000 | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known source |
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205.8 | Q3 Q = Miscellaneous internet resources 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 |
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Degradation |
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269 | Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source |
Persistent | |||||||
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269 | Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source |
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Best available data | ||||||||||
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Soil adsorption and mobility |
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37 | Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source |
Slightly mobile | |||||||
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1680 | ||||||||||
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Best available data | ||||||||||
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Fate indices |
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1.88 | Calculated | Transition state | ||||||||||||||||||||||||||
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7.11 X 10-02 | Calculated | - | |||||||||||||||||||||||||
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High | Calculated | - | ||||||||||||||||||||||||||
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Slightly mobile | Calculated | - |
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Low risk | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Based on LogP < 34 = Verified data |
Low risk | |||||||
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> 5000 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
Low | ||||||||
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> 5620 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Colinus virginianus4 = Verified data |
Low | ||||||||
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> 25 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 4 = Verified data |
Moderate | |||||||
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General |
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High (class III) | - | - | ||||||||
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> 5000 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
Low | ||||||||
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5000 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
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> 5 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
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Intraperitoneal LD₅₀ = 500 mg kg⁻¹ | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) Mouse3 = Unverified data of known source |
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Health issues |
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Highly toxic Liver, kidney, renal and cardiovascular system toxicant May cause anemia, leucopenia and thrombocytopenia May damage muscular coordination |
Handling issues |
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When heated to decomposition it emits toxic fumes of Arsenic Fire extinguishing agents include dry powder, water, sand, carbon dioxide and foam. |
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Xi - Irritant: R36/37/38 | |||
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S26-36 | |||
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NL (Not listed) | |||
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None | |||
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calcium acid methanearsonate | ||
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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 |