Cyanazine is a triazine herbicide. It is moderately soluble in water and many organic solvents and it is relatively volatile. It is not persistent in soil systems but can often be persistent in water. It is moderately toxic to mammals and may have serious adverse health effects if ingested as it is a neurotoxin, a suspected endocrine disrupter and a development/reproduction toxin. Cyanazine is moderately toxic to most fauna and flora.
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: GUS: Transition state; Drainflow: Moderately mobile
Ecotoxicity High alert: Fish chronic ecotoxicity: High
Human health High alert: Endocrine distrupter; Reproduction/development effects; Neurotoxicant
GENERAL INFORMATION
Description
A pre-emergence herbicide used for general weed control includings grasses and broad-leaved weeds in a range of crops
Potential groundwater contaminant; Chemical subject to PIC regulations
Relevant Environmental Water Quality Standards
-
Herbicide Resistance Classification (HRAC)
C1
Herbicide Resistance Classification (WSSA)
5
Insecticide Resistance Classification (IRAC)
Not applicable
Fungicide Resistance Classification (FRAC)
Not applicable
Examples of recorded resistance
Kochia scoparia
Physical state
White crystals
Formulations
Property
Value
Example manufacturers & suppliers of products using this active now or historically
Syngenta
Shell Chemical Co
DuPont
BASF
Example products using this active
Fortrol
Bladex
Payze
Blanchol
Formulation and application details
Supplied in a wide range of formulations including suspension concentrates, wettable powders, granules & water-dispersible powders
ENVIRONMENTAL FATE
Property
Value
Source; quality score; and other information
Interpretation
Solubility - In water at 20 °C (mg l⁻¹)
171
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Moderate
Solubility - In organic solvents at 20 °C (mg l⁻¹)
195000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Acetone
-
45000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Ethanol
-
15000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Benzene
-
15000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Hexane
-
Melting point (°C)
168
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
-
Boiling point (°C)
-
-
-
Degradation point (°C)
-
-
-
Flashpoint (°C)
-
-
-
Octanol-water partition coefficient at pH 7, 20 °C
P
1.26 X 1002
Calculated
-
Log P
2.1
H4 H = The US ARS pesticide properties database (click here ) 4 = Verified data
Low
Fat solubility of residues
Solubility
-
-
-
Data type
-
-
-
Density (g ml⁻¹)
1.29
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
-
Dissociation constant pKa) at 25 °C
12.9
DW4 DW = Don Wauchope personal database for Pka data: Wauchope, R. D. and Edwards, J. Dissociation constants for pesticide active ingredients: a database and comparison with predicted values. MS in preparation 4 = Verified data
-
Very weak acid
Vapour pressure at 20 °C (mPa)
0.000213
H4 H = The US ARS pesticide properties database (click here ) 4 = Verified data
Low volatility
Henry's law constant at 25 °C (Pa m³ mol⁻¹)
6.60 X 10-06
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)
16
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Non-persistent
DT₅₀ (lab at 20 °C)
16
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Non-persistent
DT₅₀ (field)
-
-
-
DT₉₀ (lab at 20 °C)
-
-
-
DT₉₀ (field)
-
-
-
DT₅₀ modelling endpoint
-
-
-
Note
Other sources: DT₅₀ 12-25 days (R3)
Dissipation rate RL₅₀ on plant matrix
Value
-
-
-
Note
-
Dissipation rate RL₅₀ on and in plant matrix
Value
4.0
R4 R = Peer reviewed scientific publications 4 = Verified data
-
Note
Various grasses, n=3
Aqueous photolysis DT₅₀ (days) at pH 7
Value
Stable
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Stable
Note
-
Aqueous hydrolysis DT₅₀ (days) at 20 °C and pH 7
Value
Stable
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Stable
Note
Stable pH 5 to pH 9, hydrolysed by strong acids and alkalis
Water-sediment DT₅₀ (days)
84
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Moderately fast
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
Moderately mobile
Koc
190
Notes and range
Other sources: 30-427 mL g⁻¹ (R3)
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
2.07
Calculated
Transition state
SCI-GROW groundwater index (μg l⁻¹) for a 1 kg ha⁻¹ or 1 l ha⁻¹ application rate
Value
6.25 X 10-02
Calculated
-
Note
-
Potential for particle bound transport index
Low
Calculated
-
Potential for loss via drain flow
Moderately mobile
Calculated
-
Bio-concentration factor
BCF (l kg⁻¹)
157
P4 P = Other governments and regulators 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