Methylarsonic acid
Last updated: 24/01/2023
(Also known as: MAA; methane arsonic acid; monomethylarsonic acid ; methylarsinic acid)
The following alerts are based on the data in the tables below. An absence of an alert does not imply the substance has no implications for human health, biodiversity or the environment but just that we do not have the data to form a judgement.
Environmental fate
Ecotoxicity
Human health
 
A largely obsolete herbicide that was used on turf to control paspalum and summer grass
Grass weeds
Turf
-
Considered obsolete but may be available in some countries
1994
Not approved
Not applicable
No UK approval for use
EC Regulation 1107/2009 (repealing 91/414)
Not approved
Not applicable
Not applicable
Not applicable
No
ATAustria
BEBelgium
BGBulgaria
CYCyprus
CZCzech Republic
DEGermany
DKDenmark
EEEstonia
ELGreece
 
 
 
 
 
 
 
 
 
ESSpain
FIFinland
FRFrance
HRCroatia
HUHungary
IEIreland
ITItaly
LTLithuania
LULuxembourg
 
 
 
 
 
 
 
 
 
LVLatvia
MTMalta
NLNetherlands
PLPoland
PTPortugal
RORomania
SESweden
SISlovenia
SKSlovakia
 
 
 
 
 
 
 
 
 
ISIceland
NONorway
 
 
 
 
 
 
 
 
 
None
CH₅AsO₃
C[As](=O)(O)O
-
QYPPRTNMGCREIM-UHFFFAOYSA-N
InChI=1S/CH5AsO3/c1-2(3,4)5/h1H3,(H2,3,4,5)
Yes
Herbicide
Organometal herbicide; Arsenical herbicide
-
-
Synthetic
Selective, contact action with some systemic properties. Readily absorbed by leaves and translocates throughout the plant
124-58-3
204-705-6
None allocated
128876
8948
No data found
139.97
-
methylarsonic acid
methylarsonic acid
-
-
Not known
Not known
Not applicable
Not applicable
-
White hydroscopic crystals
Usually formulated as a soluble concentrate
2.56E+05
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
High
-
-
-
161
-
-
-
-
-
-
-
-
-
-
6.61 X 10-02
Calculated
-
-1.18
Low
-
-
-
-
-
-
-
-
-
4.1
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
-
Strong dibasic acid
215.97
Highly volatile
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Soil adsorption and mobility
-
-
-
Cannot be calculated
-
-
-
-
-
-
-
-
-
Low risk
Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source
Based on LogP < 3
Low risk
-
-
None
Terrestrial ecotoxicology
2833
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
Low
-
-
-
-
-
-
-
-
> 425
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Colinus virginianus
Moderate
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
68.0
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Moderate
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
77.5
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Daphnia magna
Moderate
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
HUMAN HEALTH AND PROTECTION
High (class III)
-
-
2833
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
Low
-
-
-
2.2
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat 4 hr
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
EU MRL pesticide database 
-
-
-
-
-
-
-
-
-
-
Carcinogen
Endocrine disruptor
✓Yes, known to cause a problem
A0 A = Chromosome aberration (EFSA database) 0 = No data
; B0 B = DNA damage/repair (EFSA database) 0 = No data
; C0 C = Gene mutation (EFSA database) 0 = No data
; D0 D = Genome mutation (EFSA database) 0 = No data
; E0 E = Unspecified genotoxicity type (miscellaneous data source) 0 = No data
No data found
Reproduction / development effects
Acetyl cholinesterase inhibitor
Neurotoxicant
No data found
XNo, known not to cause a problem
No data found
Respiratory tract irritant
Skin irritant
Skin sensitiser
✓Yes, known to cause a problem
✓Yes, known to cause a problem
No data found
Eye irritant
Phototoxicant
 
✓Yes, known to cause a problem
No data found
 
May cause abdominal pain, diarrhoea and vomiting if ingested Possible kidney and liver toxicant IARC group 2B carcinogen
Emits toxic and irritating fumes in a fire
-
III (Slightly hazardous)
-
-
methylarsonic acid
-
-
-
-
-
-
-
-
-
-
-
Record last updated:
24/01/2023
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