(Also known as: methoxychlore; dimethoxy-DT; dianisyl trichloroethane; ENT 1716; DMDT)
SUMMARY
Data alerts
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
Environmental fate High alert: Persistent; Potential for particle bound transport: High
Ecotoxicity High alert: Fish acute ecotoxicity: High; Daphnia acute ecotoxicity: High; Daphnia chronic ecotoxicity: High
Human health High alert: Endocrine distrupter; Neurotoxicant
GENERAL INFORMATION
Description
An insecticide effective against a wide range of pests encountered in agricultural (crops and livestock), horticulture and domestic situations
Example pests controlled
Flies, Mosquitoes; Cockroaches; Chiggers
Example applications
Liverstock pest control; Domestic gardens; Pet pest management
Efficacy & activity
-
Availability status
Current
Introduction & key dates
circa 1948
UK regulatory status
UK COPR regulatory status
Not approved
Date COPR inclusion expires
Expired
UK LERAP status
No UK approval for use
EC Regulation 1107/2009 (repealing 91/414)
EC Regulation 1107/2009 status
Not approved
Dossier rapporteur/co-rapporteur
-
Date EC 1107/2009 inclusion expires
Expired
EU Candidate for substitution (CfS)
-
Listed in EU database
Yes
Approved for use (✓) under EC 1107/2009 in the following EU Member States
Octanol-water partition coefficient at pH 7, 20 °C
P
6.76 X 1005
Calculated
-
Log P
5.83
Q2 Q = Miscellaneous internet resources 2 = Unverified data of unknown source
High
Fat solubility of residues
Solubility
Soluble
A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes
-
Data type
Observed in metabolism and farm animal feeding studies
A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes
-
Density (g ml⁻¹)
1.41
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
-
Dissociation constant pKa) at 25 °C
-
-
-
-
Vapour pressure at 20 °C (mPa)
0.08
Q2 Q = Miscellaneous internet resources 2 = Unverified data of unknown source
Low volatility
Henry's law constant at 25 °C (Pa m³ mol⁻¹)
2.00 X 10-02
V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known source
Non-volatile
Maximum UV-vis absorption L mol⁻¹ cm⁻¹
-
-
-
Surface tension (mN m⁻¹)
-
-
-
Degradation
Property
Value
Source; quality score; and other information
Interpretation
General biodegradability
-
Soil degradation (days) (aerobic)
DT₅₀ (typical)
120
G4 G = Extension Toxicology network database EXTOXNET (click here ) 4 = Verified data
R3 R = Peer reviewed scientific publications 3 = Unverified data of known source
-
Note
Cherry leaves, n=1
Dissipation rate RL₅₀ on and in plant matrix
Value
1.8
R3 R = Peer reviewed scientific publications 3 = Unverified data of known source
-
Note
Collard leaves, n=1
Aqueous photolysis DT₅₀ (days) at pH 7
Value
-
-
-
Note
-
Aqueous hydrolysis DT₅₀ (days) at 20 °C and pH 7
Value
-
-
-
Note
-
Water-sediment DT₅₀ (days)
-
-
-
Water phase only DT₅₀ (days)
-
-
-
Soil adsorption and mobility
Property
Value
Source; quality score; and other information
Interpretation
Linear
Kd
-
G3 G = Extension Toxicology network database EXTOXNET (click here ) 3 = Unverified data of known source
Non-mobile
Koc
80000
Notes and range
Best available data
Freundlich
Kf
-
-
-
Kfoc
-
1/n
-
Notes and range
-
pH sensitivity
-
Fate indices
Property
Value
Source; quality score; and other information
Interpretation
GUS leaching potential index
-1.88
Calculated
Low leachability
SCI-GROW groundwater index (μg l⁻¹) for a 1 kg ha⁻¹ or 1 l ha⁻¹ application rate
Value
5.35 X 10-03
Calculated
-
Note
Estimated concentrations of chemicals with Koc values greater than 9995 ml g⁻¹ are beyond the scope of the regression data used in SCI-GROW development. If there are concerns for such chemicals, a higher tier groundwater exposure assessment should be considered, regardless of the concentration returned by SCI-GROW
Potential for particle bound transport index
High
Calculated
-
Potential for loss via drain flow
Non-mobile
Calculated
-
Bio-concentration factor
BCF (l kg⁻¹)
1622
E3 E = Manufacturers safety data sheets 3 = Unverified data of known source
(Other literature values Log BCF range 2.8-4.1 (R3))
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
Environmental fate
