Dimepiperate is a rice herbicide that has a safening effect in rice especially against sulfonylurea herbicides. It has a low aqueous solubility and a low volatility. It is not expected to be persistent in soil systems, nor is it expected to leach to groundwaters. Dimepiperate is moderately toxic to fish but is less toxic to birds. it is moderately toxic to mammals if ingested and is an 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 Moderate alert: Drainflow: Slightly mobile; Potential for particle bound transport: Medium
Example manufacturers & suppliers of products using this active now or historically
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Example products using this active
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Formulation and application details
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ENVIRONMENTAL FATE
Property
Value
Source; quality score; and other information
Interpretation
Solubility - In water at 20 °C (mg l⁻¹)
20
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Low
Solubility - In organic solvents at 20 °C (mg l⁻¹)
6200000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Acetone
-
5800000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Chloroform
-
4100000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Ethanol
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2000000
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Hexane
-
Melting point (°C)
39.1
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
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Boiling point (°C)
164
L2 L = Pesticide manuals and hard copy reference books / other sources 2 = Unverified data of unknown source
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Degradation point (°C)
-
-
-
Flashpoint (°C)
-
-
-
Octanol-water partition coefficient at pH 7, 20 °C
P
1.05 X 1004
Calculated
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Log P
4.02
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
High
Fat solubility of residues
Solubility
-
-
-
Data type
-
-
-
Density (g ml⁻¹)
1.08
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
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Dissociation constant pKa) at 25 °C
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-
-
-
Vapour pressure at 20 °C (mPa)
0.53
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Low volatility. If applied directly to plants, drift is a concern & mitigation is advisable
Henry's law constant at 25 °C (Pa m³ mol⁻¹)
7.02 X 10-03
V3 V = ChemID Online Databases; Chemspider; PubChem. (ChemID ) 3 = Unverified data of known source
Non-volatile
Volatilisation as max % of applied dose lost
From plant surface
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-
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From soil surface
-
-
-
Maximum UV-vis absorption L mol⁻¹ cm⁻¹
-
-
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Surface tension (mN m⁻¹)
-
-
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Degradation
Property
Value
Source; quality score; and other information
Interpretation
General biodegradability
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Soil degradation (days) (aerobic)
DT₅₀ (typical)
7
L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source
Non-persistent
DT₅₀ (lab at 20 °C)
-
-
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DT₅₀ (field)
-
-
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DT₉₀ (lab at 20 °C)
-
-
-
DT₉₀ (field)
-
-
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DT₅₀ modelling endpoint
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-
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Note
Paddy fields DT₅₀ typically 7 days
Dissipation rate RL₅₀ (days) on plant matrix
Value
-
-
-
Note
-
Dissipation rate RL₅₀ (days) on and in plant matrix
Value
-
-
-
Note
-
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)
-
-
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Water phase only DT₅₀ (days)
-
-
-
Sediment phase only DT₅₀ (days)
-
-
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Air degradation
As this parameter is not normally measured directly, a surrogate measure is used: ‘Photochemical oxidative DT₅₀’. Where data is available, this can be found in the Fate Indices section below.
Decay in stored produce DT₅₀
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Soil adsorption and mobility
Property
Value
Source; quality score; and other information
Interpretation
Linear
Kd (mL g⁻¹)
-
Q2 Q = Miscellaneous data from online sources 2 = Unverified data of unknown source
Slightly mobile
Koc (mL g⁻¹)
3437
Notes and range
Estimated
Freundlich
Kf (mL g⁻¹)
-
-
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Kfoc (mL g⁻¹)
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1/n
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Notes and range
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pH sensitivity
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Fate indices
Property
Value
Source; quality score; and other information
Interpretation
GUS leaching potential index
0.39
Calculated
Low leachability
SCI-GROW groundwater index (μg l⁻¹) for a 1 kg ha⁻¹ or 1 l ha⁻¹ application rate
Value
6.23 X 10-03
Calculated
-
Note
-
Potential for particle bound transport index
Medium
Calculated
-
Potential for loss via drain flow
Slightly mobile
Calculated
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Photochemical oxidative DT₅₀ (hrs) as indicator of long-range air transport risk
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
Warning:
