Florpyrauxifen (Ref: X11438848)

Florpyrauxifen (Ref: X11438848)	Last updated: 07/02/2026
(Also known as: XDE 848 acid)

SUMMARY

Hazard alerts

The following Pesticide Hazard Tricolour (PHT) 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. The alerts for Highly Hazardous Pesticides (HHPs) are based on applying the FAO/WHO (Type 1) and the PAN (Type II) criteria to PPDB data. Further details on the HHP indicators are given in the tables below. Neither the PHT nor the HHP hazard alerts take account of usage patterns or exposure, thus they do not represent risk.

PHT: Environmental fate	PHT: Ecotoxicity	PHT: Human health	Highly Hazardous Pesticide
Environmental fate High alert: GUS: High leachability	Ecotoxicity Moderate alert: Birds chronic ecotoxicity: Moderate; Daphnia acute ecotoxicity: Moderate	Human health Low alert Warning: Significant data are missing

GENERAL INFORMATION

Description

A herbicide, usually used as the benzyl derivative, with various applications including as a rice weed herbicide particularly in Australia

Example pests controlled

Grass weeds including Barnyardgrass; Sedges; Broadleaf weeds including water plantain, starfruit, arrowhead, jerry jerry and dirty Dora

Example applications

Rice

Efficacy & activity

Shown to be highly effective in research studies

GB regulatory status

GB COPR regulatory status

Approved as the benzyl derivative

Date COPR inclusion expires

24/07/2029

GB LERAP status

No UK approval for use as a plant protection agent

EC Regulation 1107/2009 (repealing 91/414)

EC Regulation 1107/2009 status

Approved

Dossier rapporteur/co-rapporteur

Italy

Date EC 1107/2009 inclusion expires

24/07/2029

EU Candidate for substitution (CfS)

Listed in EU database

Yes as the benzyl derivative

Approved for use (✓) under EC 1107/2009 in the following EU Member States

ATAustria	BEBelgium	BGBulgaria	CYCyprus	CZCzech Republic	DEGermany	DKDenmark	EEEstonia	ELGreece
								✓
ESSpain	FIFinland	FRFrance	HRCroatia	HUHungary	IEIreland	ITItaly	LTLithuania	LULuxembourg
						✓
LVLatvia	MTMalta	NLNetherlands	PLPoland	PTPortugal	RORomania	SESweden	SISlovenia	SKSlovakia

Approved for use (✓) under EC 1107/2009 by Mutual Recognition of Authorisation and/or national regulations in the following EEA countries

ISIceland	NONorway

Additional information

Also used in

Chemical structure

Isomerism

None

Chemical formula

C₁₃H₈Cl₂F₂N₂O₃

Canonical SMILES

COC1=C(C=CC(=C1F)C2=NC(=C(C(=C2F)N)Cl)C(=O)O)Cl

Isomeric SMILES

International Chemical Identifier key (InChIKey)

XFZUQTKDBCOXPP-UHFFFAOYSA-N

International Chemical Identifier (InChI)

InChI=1S/C13H8Cl2F2N2O3/c1-22-12-5(14)3-2-4(7(12)16)10-8(17)9(18)6(15)11(19-10)13(20)21/h2-3H,1H3,(H2,18,19)(H,20,21)

2D structure diagram/image available?

Yes

General status

Pesticide type

Herbicide; Metabolite

Metabolite Type

Soil; Surface water; Sediment; Groundwater

Substance groups

Pyridine herbicide; Picolinic acid herbicide

Minimum active substance purity

Known relevant impurities

Substance origin

Synthetic

Mode of action

Appears to disrupt the phytohormone balance, leading to the overproduction of ethylene and abscisic acid in weeds

CAS RN

943832-81-3

EC number

No data found

CIPAC number

990

US EPA chemical code

PubChem CID

67420724

CLP index number

No data found

Molecular mass

349.10

PIN (Preferred Identification Name)

4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-5-fluoropyridine-2-carboxylic acid

IUPAC name

4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-5-fluoropyridine-2-carboxylic acid

CAS name

4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-5-fluoro-2-pyridinecarboxylic acid

Global Governance status: Listed (✓) under

UK Poisons List Order 1972	Rotterdam Convention	Montreal Protocol
XNo The Poisons List Order 1972	XNo Rotterdam Convention	XNo Montreal Protocol
Stockholm Convention	OSPAR	EU Water Framework Directive
XNo Stockholm Convention	XNo OSPAR	XNo EU Water Framework Directive

Relevant Environmental Water Quality Standards

Forever chemical

Highly Hazardous Pesticide (HHP)

Type I

Type II

Other status information

Herbicide Resistance Class (HRAC MoA class)

Herbicide Resistance Class (WSSA MoA class)

Insecticide Resistance Class (IRAC MoA class)

Not applicable

Fungicide Resistance Class (FRAC MOA class)

Not applicable

Examples of recorded resistance

Physical state

Related substances & organisms

florpyrauxifen-benzyl

Can be a metabolite of:

Parent

Formation medium

Estimated maximum occurrence fraction

1107/2009 relevancy

florpyrauxifen-benzyl

Soil

0.62

Major fraction

florpyrauxifen-benzyl

Groundwater

Not relevant

Commercial

Property

Value

Availability status

Current

Introduction & key dates

2016, introduced

Example manufacturers & suppliers of products using this active now or historically

Dow AgroSciences

Example products using this active

Rinskor

Formulation and application details

Usually supplied as an emulsifiable concentrate but also available as a suspension concentrate.

Commercial production

Florpyrauxifen is produced through a modular sequence typical of synthetic auxin herbicides. The process begins with constructing the halogenated pyridine carboxylic acid core through controlled halogenation and subsequent carbon–carbon bond formation. This intermediate is then functionalised to introduce the aryl ether side chain that defines the herbicide’s activity. For florpyrauxifen, the route proceeds by converting the functionalised intermediate to the free acid, followed by purification and crystallisation.

Impact on climate of production and use

ENVIRONMENTAL FATE

Property

Value

Source; quality score; and other information

Interpretation

Solubility - In water at 20 °C at pH 7 (mg l⁻¹)

Solubility - In organic solvents at 20 °C (mg l⁻¹)

Melting point (°C)

Boiling point (°C)

Degradation point (°C)

Flashpoint (°C)

Octanol-water partition coefficient at pH 7, 20 °C

Log P

Fat solubility of residues

Solubility

Soluble

Data type

Regulatory data

Density (g ml⁻¹)

Dissociation constant pKa) at 25 °C

Vapour pressure at 20 °C (mPa)

Henry's law constant at 25 °C (Pa m³ mol⁻¹)

Volatilisation as max % of applied dose lost

From plant surface

From soil surface

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

Not readily biodegradeable

Soil degradation (days) (aerobic)

DT₅₀ (typical)

39.8

Moderately persistent

DT₅₀ (lab at 20 °C)

39.8

Moderately persistent

DT₅₀ (field)

DT₉₀ (lab at 20 °C)

131.3

Persistent

DT₉₀ (field)

DT₅₀ modelling endpoint

10.6

mean flooded paddy soil

Note

EU 2017 dossier lab studies DT₅₀ range 28-54 days, DT₉₀ range 92-178 days, Soils =4; Flooded paddy soil DT₅₀ range 7-10 days, DT₉₀ range 23-33 days, Soils=2

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)

5.8

Fast

Water phase only DT₅₀ (days)

5.4

Moderately fast

Sediment phase only DT₅₀ (days)

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

Soil adsorption and mobility

Property

Value

Source; quality score; and other information

Interpretation

Linear

K_d (mL g⁻¹)

1.83

Moderately mobile

K_oc (mL g⁻¹)

105.2

Notes and range

EU 2017 dossier K_d range 0.292-3.915 mL g⁻¹, K_oc range 37.8-301.1 mL g⁻¹, Soils=12

Freundlich

K_f (mL g⁻¹)

1.35

Moderately mobile

K_foc (mL g⁻¹)

77.1

¹/_n

0.86

Notes and range

EU 2017 dossier K_f range 0.26-2.54 mL g⁻¹, K_foc range 30.3-195.5 mL g⁻¹, ¹/_n range 0.82-0.89, Soils=12

pH sensitivity

Yes - increased sorption in acid soils

Fate indices

Property

Value

Source; quality score; and other information

Interpretation

GUS leaching potential index

3.38

Calculated

High leachability

SCI-GROW groundwater index (μg l⁻¹) for a 1 kg ha⁻¹ or 1 l ha⁻¹ application rate

Value

4.69 X 10^-01

Calculated

Note

Potential for particle bound transport index

Potential for loss via drain flow

Moderately mobile

Calculated

Photochemical oxidative DT₅₀ (hrs) as indicator of long-range air transport risk

Bio-concentration factor

BCF (l kg⁻¹)

CT₅₀ (days)

Known metabolites

None

ECOTOXICOLOGY

Terrestrial ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

> 5000

Rat as benzyl variant

Low

Mammals - Short Term Oral NOAEL (mg kg⁻¹ bw d⁻¹)

1000

Rat 28-day as benzyl variant

Low

Mammals - Long Term (Chronic) Oral NOAEL (mg kg⁻¹ bw d⁻¹)

300

Rat 2-yr as benzyl variant

Low

Birds - Acute LD₅₀ (mg kg⁻¹)

> 2250

Colinus virginianus as benzyl derivative

Low

Birds - Short term dietary (LC₅₀/LD₅₀)

Birds - Chronic 21d NOEL (mg kg⁻¹ bw d⁻¹)

87.2

Colinus virginianus NOEL as benzyl variant

Moderate

Earthworms - Acute 14 day LC₅₀ (mg kg⁻¹ dw soil)

Earthworms - Chronic NOEC, reproduction (mg kg⁻¹ dw soil)

213

Eisenia foetida 56 day

Low

Soil micro-organisms

Nitrogen mineralisation: No significant adverse effect
Carbon mineralisation: No significant adverse effect

Dose: 0.093 & 0.467 mg kg⁻¹ soil 28 Day

Collembola

Acute LC₅₀ (mg kg⁻¹)

Chronic NOEC (mg kg⁻¹)

Folsomia candida

Non-target plants

Vegetative vigour ER₅₀ (g ha⁻¹)

1.2

Daucus carota

Seedling emergence ER₅₀ (g ha⁻¹)

Honeybees (Apis spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

> 100

Apis mellifera as benzyl variant

Low

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

> 105.4

Apis mellifera as benzyl variant

Low

Unknown mode acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Chronic

Notes

Bumblebees (Bombus spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Mason bees (Osmia spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Other bee species (1)

Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)

Mode of exposure

Other bee species (2)

Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)

Mode of exposure

Beneficial insects (Ladybirds)

Beneficial insects (Lacewings)

Beneficial insects (Parasitic wasps)

Beneficial insects (Predatory mites)

Beneficial insects (Ground beetles)

Beneficial insects (Butterflies)

Contact

Notes

Oral

Notes

Aquatic ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Temperate Freshwater Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

> 100

Oncorhynchus mykiss

Low

Temperate Freshwater Fish - Chronic 21 day NOEC (mg l⁻¹)

Tropical Freshwater Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

Temperate Freshwater Aquatic invertebrates - Acute 48 hour EC₅₀ (mg l⁻¹)

> 91.8

Daphnia magna

Moderate

Temperate Freshwater Aquatic invertebrates - Chronic 21 day NOEC (mg l⁻¹)

Daphnia magna

Low

Tropical Freshwater Aquatic invertebrates - Acute 48 hour EC₅₀ (mg l⁻¹)

Aquatic crustaceans - Acute 96 hour LC₅₀ (mg l⁻¹)

Sediment dwelling organisms - Acute 96 hour LC₅₀ (mg l⁻¹)

Sediment dwelling organisms - Chronic 28 day NOEC, static, water (mg l⁻¹)

Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg⁻¹)

Aquatic Plants (free-floating, fonds growth, fresh) - 7 day (mg l⁻¹)

Aquatic plants (rooted, growth rate, fresh) - 14 day (mg l⁻¹)

Algae - Acute (growth rate, fresh; mg l⁻¹) (96 hr ErC₅₀, Static)

57.0

Raphidocelis subcapitata

Low

Algae - Chronic (growth rate, fresh; mg l⁻¹)

Mesocosm study data

NOEAEC mg l⁻¹

Marine bivalves

Regulatory Threshold Levels (RTLs) used to calculate Total Applied Toxicity (TAT)

Species group

RTL

Notes

Mammals

Worst case of acute and chronic mammals

Birds

17.44

Worst case of acute and chronic birds

Soil organisms

42.6

Worst case of acute and chronic earthworms

Terrestrial plants

0.24

Worst case of non-target plants vegetative vigour and seedling emergence

Pollinators

Worst case of contact and oral honeybees

Arthropods

No data

No data for parasitic wasps and predatory mites

Fish

Worst case of temperate acute and chronic fish

Aquatic invertebrates

0.918

Worst case of temperate acute and chronic aquatic invertebrates

Aquatic plants

5.7

Worst case of free-floating plants, rooted plants, acute and chronic algae

HUMAN HEALTH AND PROTECTION

General

Property

Value

Source; quality score; and other information

Interpretation

Threshold of Toxicological Concern (Cramer Class)

High (class III)

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

> 5000

Rat as benzyl variant

Low

Mammals - Short Term Oral NOAEL (mg kg⁻¹ bw d⁻¹)

1000

Rat 28-day as benzyl variant

Low

Mammals - Long Term (Chronic) Oral NOAEL (mg kg⁻¹ bw d⁻¹)

300

Rat 2-yr as benzyl variant

Low

Mammals - Dermal LD₅₀ (mg kg⁻¹ body weight)

> 5000

Rat as benzyl variant

Mammals - Inhalation LC₅₀ (mg l⁻¹)

Other Mammal toxicity endpoints

ADI - Acceptable Daily Intake (mg kg⁻¹ bw day⁻¹)

0.5

ARfD - Acute Reference Dose (mg kg⁻¹ bw day⁻¹)

None allocated

AAOEL - Acute Acceptable Operator Exposure Level (mg kg⁻¹ bw day⁻¹)

AOEL - Acceptable Operator Exposure Level - Systemic (mg kg⁻¹ bw day⁻¹)

0.13

Dermal penetration studies (%)

Dangerous Substances Directive 76/464

Exposure Routes

Public

Occupational

MRLs

European

EU MRL pesticide database

Great Britain

GB MRL Register

Notes

Drinking Water Standards

Drinking Water MAC (μg l⁻¹)

Mammalian dose elimination route and rate

Readily eliminated via urine and faeces

Health issues

Specific human health issues (hazard-based)

Carcinogen

Genotoxic

Endocrine disruptor

No data found

; ; ; ;

No data found

Reproduction / development effects

Acetyl cholinesterase inhibitor

Neurotoxicant

No data found

Respiratory tract irritant

Skin irritant

Skin sensitiser

No data found

Eye irritant

Phototoxicant

No data found

General human health issues

No information available

Handling issues

Property

Value and interpretation

General

No information available

CLP classification 2013

WHO Classification

Not listed (Not listed)

UN Number

Waste disposal & packaging

Shelf-life, storage, stability and reactivity

TRANSLATIONS

Language

Name

English

florpyrauxifen

French

florpyrauxifene

German

Danish

Italian

Spanish

Greek

Polish

Swedish

Hungarian

Dutch

Norwegian

Record last updated:	07/02/2026
Contact:	aeru@herts.ac.uk
Please cite as:	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

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