(Also known as: chloroxyphenidin; chloroxyfenidim )
SUMMARY
Chloroxuron is a herbicide used to control annual weeds and grasses. It has a low aqueous solubility and is not volatile. It is moderately persistent in soil systems but is unlikely to persist in aquatic systems. Based on its physico-chemical properties it is not expected to leach to groundwater. It is moderately toxic to birds, fish, aquatic invertebrates, algae and honey bees. Mammalian toxicity is low.
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 Moderate alert: Moderately persistent; Drainflow: Slightly mobile; Potential for particle bound transport: Medium
Photosynthetic electron transport inhibitor at the photosystem II receptor. Growth inhibition and chlorotic and necrotic effects on foliage
CAS RN
1982-47-4
EC number
217-843-7
CIPAC number
187
US EPA chemical code
025501
PubChem CID
16115
Molecular mass
290.75
PIN (Preferred Identification Name)
N'-[4-(4-chlorophenoxy)phenyl]-N,N-dimethylurea
IUPAC name
3-[4-(4-chlorophenoxy)phenyl]-1,1-dimethylurea
CAS name
N'-[4-(4-chlorophenoxy)phenyl]-N,N-dimethylurea
Other status information
-
Relevant Environmental Water Quality Standards
-
Herbicide Resistance Classification (HRAC)
C2
Herbicide Resistance Classification (WSSA)
7
Insecticide Resistance Classification (IRAC)
Not applicable
Fungicide Resistance Classification (FRAC)
Not applicable
Examples of recorded resistance
-
Physical state
Solid
Formulations
Property
Value
Example manufacturers & suppliers of products using this active now or historically
Syngenta
Ciba Geigy AG
Example products using this active
Tenoran
Norex
Gesamoos
Formulation and application details
Usually supplied as a wettable powder
ENVIRONMENTAL FATE
Property
Value
Source; quality score; and other information
Interpretation
Solubility - In water at 20 °C (mg l⁻¹)
3.7
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Low
Solubility - In organic solvents at 20 °C (mg l⁻¹)
44000
CA3 CA = Medical and toxicological databases and information systems e.g. TOXNET (click here ) 3 = Unverified data of known source
Acetone
-
106000
CA3 CA = Medical and toxicological databases and information systems e.g. TOXNET (click here ) 3 = Unverified data of known source
Dichloromethane
-
4000
CA3 CA = Medical and toxicological databases and information systems e.g. TOXNET (click here ) 3 = Unverified data of known source
Toluene
-
35000
CA3 CA = Medical and toxicological databases and information systems e.g. TOXNET (click here ) 3 = Unverified data of known source
Toluene
-
Melting point (°C)
151
Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source
-
Boiling point (°C)
-
-
-
Degradation point (°C)
-
-
-
Flashpoint (°C)
-
-
-
Octanol-water partition coefficient at pH 7, 20 °C
P
2.51 X 1003
Calculated
-
Log P
3.4
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
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)
-
-
-
Dissociation constant pKa) at 25 °C
-
-
-
-
Vapour pressure at 20 °C (mPa)
2.30 X 10-04
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Low volatility
Henry's law constant at 25 °C (Pa m³ mol⁻¹)
6.00 X 10-05
H4 H = The US ARS pesticide properties database (click here ) 4 = Verified data
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)
36
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
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
