Dimethametryn (Ref: C 18898)
Last updated: 02/09/2023
(Also known as: dimethametryne; dimethametorin)
Dimethametryn is a rice herbicide. It has a moderate aqueous solubility and, based on its chemical properties, it only slightly mobile and would not be expected to leach to groundwater. It tends to be persistent in soil systems and may also persist in aqueous systems. It is not susceptible to hydrolysis. It has a low mammalian toxicity and is a recognised irritant. It is moderately toxic to fish, aquatic invertebrates and honeybees.
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
Used to control broad-leaved weeds and grasses in rice and other crops
Couch grass; Crabgrass; Pigweed
Rice; Vegetables including cabbage, aubergine; Tomatoes; Tea; Sugarcane
-
-
circa 1972
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
 
 
 
 
 
 
 
 
 
Dimethametryn is a chiral molecule and the technical material is an isomeric mixture.
C₁₁H₂₁N₅S
CCNC1=NC(=NC(=N1)SC)NC(C)C(C)C
No data
IKYICRRUVNIHPP-UHFFFAOYSA-N
InChI=1S/C11H21N5S/c1-6-12-9-14-10(13-8(4)7(2)3)16-11(15-9)17-5/h7-8H,6H2,1-5H3,(H2,12,13,14,15,16)
Yes
Herbicide
Methylthiotriazine herbicide
-
-
Synthetic
Selective, absorbed by roots and foliage. Inhibits photosynthesis (photosystem II).
22936-75-0
245-337-6
None allocated
080815
31573
No data found
255.38
rac-N2-ethyl-N4-[(2R)-3-methylbutan-2-yl]-6-(methylsulfanyl)-1,3,5-triazine-2,4-diamine
(RS)-N2-(1,2-dimethylpropyl)-N4-ethyl-6-methylthio-1,3,5-triazine-2,4-diamine
N-(1,2-dimethylpropyl)-N'-ethyl-6-(methylthio)-1,3,5-triazine-2,4-diamine
-
-
C1
5
Not applicable
Not applicable
-
Colourless crystalline solid
50
at 25 °C
Moderate
650000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Acetone
-
800000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Dichloromethane
-
60000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Hexane
-
700000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Methanol
-
65
-
151
L2 L = Pesticide manuals and hard copy reference books / other sources 2 = Unverified data of unknown source
-
-
-
-
-
-
-
7.94 X 1003
Calculated
-
3.90
High
-
-
-
-
-
-
1.11
Q2 Q = Miscellaneous data from online sources 2 = Unverified data of unknown source
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
140
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Persistent
140
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Persistent
-
-
-
-
-
-
-
-
-
-
-
-
Best available data
-
-
-
-
-
-
-
-
-
-
-
-
Stable
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Stable
Stable pH 5 to pH 9 over 28 days, 70 °C
-
-
-
-
-
-
Soil adsorption and mobility
-
Q2 Q = Miscellaneous data from online sources 2 = Unverified data of unknown source
Slightly mobile
3427
Estimated
-
-
-
-
-
-
-
1.00
Calculated
Low leachability
2.06 X 10-02
Calculated
-
-
High
Calculated
-
Slightly mobile
Calculated
-
-
-
-
-
-
None
Terrestrial ecotoxicology
> 3000
Rat
Low
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
100
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Moderate
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5.0
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Oncorhynchus mykiss
Moderate
-
-
-
0.92
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)
-
-
> 3000
Rat
Low
3000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
-
5.4
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
-
-
-
-
0.01
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
EU MRL pesticide database 
-
-
-
-
-
-
-
-
-
-
Carcinogen
Endocrine disruptor
No data found
A3 A = Chromosome aberration (EFSA database) 3 = Negative
; 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
 
Harmful if ingested
IMDG Transport Hazard Class 9 Not expected to autoignite; Not highly flammable
Health: H317 Environment: H400, H410
III (Slightly hazardous)
UN3077
Packaging Group III (minor danger)
-
dimethametryn
dimethametryne
Dimethametryn
-
-
dimetrametrina
-
-
-
-
-
-
Record last updated:
02/09/2023
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