Hexaconazole is a fungicide used to control powdery mildew, scabs and rusts. It has a low aqueous solubility and a low viscosity. It tends to be environmentally persistent in both soil and aquatic systrems. It is moderately toxic to birds, fish, aquatic invertebrates, algae and earthworms but has a low toxicity to honeybees. It has a low mammalian toxicity and no information on other health issues has been identified although it my be a skin and eye irritant
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
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
7.94 X 1003
Calculated
-
Log P
3.9
P4 P = Other governments and regulators 4 = Verified data
High
Fat solubility of residues
Solubility
Likely to be soluble
Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source
-
Data type
Based on chemical group
Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source
-
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
2.3
P4 P = Other governments and regulators 4 = Verified data
-
Strong acid
Vapour pressure at 20 °C (mPa)
0.018
P4 P = Other governments and regulators 4 = Verified data
Low volatility
Henry's law constant at 25 °C (Pa m³ mol⁻¹)
3.33 X 10-04
L3 L = Pesticide manuals and hard copy reference books / other sources 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)
122
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Persistent
DT₅₀ (lab at 20 °C)
-
-
-
DT₅₀ (field)
225
P3 P = Other governments and regulators 3 = Unverified data of known source
Persistent
DT₉₀ (lab at 20 °C)
-
-
-
DT₉₀ (field)
-
-
-
DT₅₀ modelling endpoint
-
-
-
Note
Sandy loam DT₅₀ ~ 10 months, clay loam ~ 5 months; General literature DT₅₀ range 49-200 days (R3)
Dissipation rate RL₅₀ on plant matrix
Value
5.3
R3 R = Peer reviewed scientific publications 3 = Unverified data of known source
-
Note
Mango, n=1
Dissipation rate RL₅₀ on and in plant matrix
Value
5.5
R4 R = Peer reviewed scientific publications 4 = Verified data
-
Note
Published literature RL₅₀ range 1.7-7.8 days, 7 field crops, various matrices, n=9
Aqueous photolysis DT₅₀ (days) at pH 7
Value
10
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Moderately fast
Note
-
Aqueous hydrolysis DT₅₀ (days) at 20 °C and pH 7
Value
Stable
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Stable
Note
Not greatly sensitive to pH
Water-sediment DT₅₀ (days)
112
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Slow
Water phase only DT₅₀ (days)
112
K4 K = Research datasets, e.g. Pandora, Demetra 4 = Verified data
Stable
Soil adsorption and mobility
Property
Value
Source; quality score; and other information
Interpretation
Linear
Kd
-
DW3 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 3 = Unverified data of known source
Slightly mobile
Koc
1040
Notes and range
-
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
2.31
Calculated
Transition state
SCI-GROW groundwater index (μg l⁻¹) for a 1 kg ha⁻¹ or 1 l ha⁻¹ application rate
Value
1.29 X 10-01
Calculated
-
Note
-
Potential for particle bound transport index
High
Calculated
-
Potential for loss via drain flow
Slightly mobile
Calculated
-
Bio-concentration factor
BCF (l kg⁻¹)
412
Q2 Q = Miscellaneous internet resources 2 = Unverified data of unknown 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
Environmental fate
Ecotoxicity
