(Also known as: barbamate; carbyne; carbine; CBN; chlorinate)
SUMMARY
Barban is an obsolete post-emergence carbonate herbicide. It has a low aqueous solubility, is volatile and would not normally be expected to leach to groundwater. It is not persistent in soiI systems and is unlikely to be persistent in water systems. It has a moderate mammalian toxicity with a low potential for bioaccumulation. There are gaps in biodiversity toxicity data but it is reported to be moderately toxic to most aquatic species.
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: Drainflow: Slightly mobile; Potential for particle bound transport: Medium
Herbicidal action is due to anti-mitotic effects, reducing plant cellular division and so retarding shoot growth. Inhibition of microtubule organisation.
CAS RN
101-27-9
EC number
202-930-4
CIPAC number
134
US EPA chemical code
017601
PubChem CID
7551
CLP index number
006-020-00-6
Molecular mass
258.10
PIN (Preferred Identification Name)
4-chlorobut-2-yn-1-yl (3-chlorophenyl)carbamate
IUPAC name
4-chlorobut-2-ynyl 3-chlorocarbanilate
CAS name
4-chloro-2-butynyl (3-chlorophenyl)carbamate
Other status information
-
Relevant Environmental Water Quality Standards
-
Herbicide Resistance Classification (HRAC)
K2
Herbicide Resistance Classification (WSSA)
23
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
Octanol-water partition coefficient at pH 7, 20 °C
P
2.57 X 1003
Calculated
-
Log P
3.41
V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known 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)
1.39
V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known source
-
Dissociation constant pKa) at 25 °C
-
-
-
-
Vapour pressure at 20 °C (mPa)
0.05
H3 H = The US ARS pesticide properties database (click here ) 3 = Unverified data of known source
Low volatility
Henry's law constant at 25 °C (Pa m³ mol⁻¹)
1.17 X 10-03
H3 H = The US ARS pesticide properties database (click here ) 3 = Unverified data of known source
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