Chlormephos (Ref: MC 2188)
Last updated: 14/01/2023
(Also known as: chlormethylfos; chlormefos)
Chlormephos is an organophosphorus insecticide. It has a moderate aqueous solubility and is not volatile. based on its chemical properties it would not normally be expected to leach to groundwater. It is not normally persistent in soil systems. It is highly toxic to mammals if ingested, inhaled or absorbed through skin , a cholinesterase inhibitor and a neurotoxciant. Ecotoxicology data is sparse but chlormephos is highly toxic to honey bees and moderately toxic to birds, fish and earthworms.
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
An insecticide used to control a wide range of foliage and soil dwelling pests
Wireworms; Millipedes; Symphylids; Mealybugs; Cutowrms; Whiteflies, Leaf rollers; Caperpillars; Scale insects; Grasshoppers; Apple moth; Earwigs; Beetles; Borers
Maize; Sugarbeet; Fruit including apples, pears, avocado, grapes, mango, citrus. kiwi; Vegetables; Cereals; Pasture
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circa 1973
Not approved
Expired
No UK approval for use
EC Regulation 1107/2009 (repealing 91/414)
Not approved
Not applicable
Expired
-
Yes
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
 
 
 
 
 
 
 
 
 
None
C₅H₁₂ClO₂PS₂
CCOP(=S)(OCC)SCCl
No data
QGTYWWGEWOBMAK-UHFFFAOYSA-N
InChI=1S/C5H12ClO2PS2/c1-3-7-9(10,8-4-2)11-5-6/h3-5H2,1-2H3
Yes
Insecticide
Organophosphate insecticide; Organothiophosphate insecticide
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-
Synthetic
Non-systemic with contact and stomach action. Acetylcholine esterase inhibitor.
24934-91-6
246-538-1
337
295300
32739
015-114-00-6
234.70
S-(chloromethyl) O,O-diethyl phosphorodithioate
S-chloromethyl O,O-diethyl phosphorodithioate
S-(chloromethyl) O,O-diethyl phosphorodithioate
Marine Pollutant; Chemical subject to PIC regulations
-
Not applicable
Not applicable
1B
Not applicable
None identified
Colourless liquid
Bayer CropScience Rhone Poulenc Murphy
Usually supplied in a granular formulations
60
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Moderate
Miscible
Acetone
-
Miscible
Methanol
-
Miscible
Ethanole
-
Miscible
Xylene
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-
-
-
-
-
-
-
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-
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-
1.10 X 1003
Calculated
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3.04
High
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-
-
-
-
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1.26
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
-
-
-
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0.0076
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Low volatility
2.97 X 1001
Moderately volatile
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20
W4 W = French database provided by ARVALIS-Institut du Végétal 4 = Verified data
Non-persistent
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Other sources: DT₅₀ 28 days, sandy soil (R4)
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Soil adsorption and mobility
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Slightly mobile
1100
Estimated
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-
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1.25
Calculated
Low leachability
2.49 X 10-02
Calculated
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-
Medium
Calculated
-
Slightly mobile
Calculated
-
120
Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source
Whole fish
Threshold for concern
Not available
-
Known groundwater metabolites
None
None
Terrestrial ecotoxicology
> 7
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
High
-
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
-
> 0.39
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-
-
-
260
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Coturnix japonica
Moderate
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-
-
-
-
-
-
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-
> 1.0
R4 R = Peer reviewed scientific publications 4 = Verified data
Eisenia andrei as LOEC
Moderate
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-
-
-
-
-
-
-
-
-
-
-
-
-
-
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> 0.9
E3 E = Manufacturers safety data sheets 3 = Unverified data of known source
High
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-
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-
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-
-
-
-
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-
2.5
Rasbora heteromorpha
Moderate
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-
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-
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-
-
-
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HUMAN HEALTH AND PROTECTION
High (class III)
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> 7
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Rat
High
7.0
Rat
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List I; List II
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May be absorbed through dermal contact
EU MRL pesticide database 
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Eliminated within 24hrs via urine
E3 E = Manufacturers safety data sheets 3 = Unverified data of known source
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Carcinogen
Endocrine disruptor
No data found
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
✓Yes, known to cause a problem
✓Yes, known to cause a problem
Respiratory tract irritant
Skin irritant
Skin sensitiser
✓Yes, known to cause a problem
No data found
No data found
Eye irritant
Phototoxicant
 
No data found
No data found
 
Very toxic if ingested, inhaled or absorbed through skin
No information available
Health: H300, H310 Environment: H400, H410
Ia (Extremely hazardous)
3018
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chlormephos
chlorméphos
Chlormephos
chlormephos
clormefos
clormefos
chlormephos
chloromefos
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-
chloormefos
Record last updated:
14/01/2023
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