Potassium phosphonates (Ref: LBG 01F34)

Potassium phosphonates (Ref: LBG 01F34)	Last updated: 24/01/2023
(Also known as: phosphite; phosphonate; KPP; potassium phosphite)

SUMMARY

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; GUS: High leachability	Ecotoxicity Moderate alert: Birds chronic ecotoxicity: Moderate; Fish chronic ecotoxicity: Moderate	Human health Low alert

GENERAL INFORMATION

Description

A mixture of two (mono- and di-) inorganic potassium salts that has fungicidal properties and is used to control Pythium and Phytophthora on a variety of fruit and ornamental crops

Example pests controlled

Pythium spp.; Phytophthora spp. including root rot

Example applications

Fruit including avocados, apples; Ornamentals; Trees

Efficacy & activity

Availability status

Current

Introduction & key dates

1997, USA

UK regulatory status

UK COPR regulatory status

Approved

Date COPR inclusion expires

30/09/2026

UK LERAP status

Crop over 5m - See Authorisation for Crop LERAP Details

EC Regulation 1107/2009 (repealing 91/414)

EC Regulation 1107/2009 status

Approved

Dossier rapporteur/co-rapporteur

France

Date EC 1107/2009 inclusion expires

31/01/2026

EU Candidate for substitution (CfS)

Listed in EU database

Yes

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
✓		✓	✓	✓	✓	✓	✓	✓

Additional information

Also used in

Australia

Chemical structure

Isomerism

None

Chemical formula

KH₂PO₃ & K₂HPO₃

Canonical SMILES

OP(O)O.[K+]

Isomeric SMILES

International Chemical Identifier key (InChIKey)

UUCFTYONLUTOFU-UHFFFAOYSA-N

International Chemical Identifier (InChI)

InChI=1S/K.H3O3P/c;1-4(2)3/h;1-3H/q+1;

2D structure diagram/image available?

Yes

General status

Pesticide type

Fungicide

Substance groups

Inorganic compound

Minimum active substance purity

<31.6 phosphonate ions, <20% potassium

Known relevant impurities

EU dossier - none declared

Substance origin

Natural

Mode of action

Mixed mode of application including direct toxicity to plant pathogens reducing populations and promotion of plants natural defences

CAS RN

13977-65-6

Alternative/old CAS RN

12492-26-7

EC number

604-162-9

CIPAC number

None allocated

US EPA chemical code

076416

PubChem CID

No data

CLP index number

No data found

Molecular mass

139 (mean)

PIN (Preferred Identification Name)

IUPAC name

Reaction mixture of Potassium hydrogen phosphonate and dipotassium phosphonate

CAS name

Reaction mixture of Potassium hydrogen phosphonate and dipotassium phosphonate

Other status information

Relevant Environmental Water Quality Standards

Herbicide Resistance Classification (HRAC)

Not applicable

Herbicide Resistance Classification (WSSA)

Not applicable

Insecticide Resistance Classification (IRAC)

Not applicable

Fungicide Resistance Classification (FRAC)

Examples of recorded resistance

Physical state

Deliquescent solids supplied in aqueous solution

Formulations

Property

Value

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

Luxembourg Industries (Pamol) Ltd
UIM Agrochemicals (Australia)

Example products using this active

Stamina

Formulation and application details

Usually supplied as an aqueous solution with a variety of application methods used including foliar sprays, soil drenches and root dips

ENVIRONMENTAL FATE

Property

Value

Source; quality score; and other information

Interpretation

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

500000

High

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

Melting point (°C)

Boiling point (°C)

Decomposes before boiling

Degradation point (°C)

180

Flashpoint (°C)

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

Not applicable

Log P

Not applicable

Fat solubility of residues

Solubility

Data type

Density (g ml⁻¹)

1.65

Dissociation constant pKa) at 25 °C

2.0

PKa(2) = 6.59

Vapour pressure at 20 °C (mPa)

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

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)

142

Persistent

DT₅₀ (lab at 20 °C)

142

Persistent

DT₅₀ (field)

DT₉₀ (lab at 20 °C)

381

Very persistent

DT₉₀ (field)

DT₅₀ modelling endpoint

Note

EU dossier lab studies DT₅₀ range 88-196 days, DT₉₀ range 319-442 days

Dissipation rate RL₅₀ on plant matrix

Value

Note

Dissipation rate RL₅₀ 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)

Water phase only DT₅₀ (days)

Soil adsorption and mobility

Property

Value

Source; quality score; and other information

Interpretation

Linear

K_d

10.7

Moderately mobile

K_oc

453.6

Notes and range

EU dossier K_d range 3.1-18.96 mL g⁻¹, K_oc range 228-972 mL g⁻¹, soils=5

Freundlich

K_f

K_foc

¹/_n

Notes and range

pH sensitivity

Fate indices

Property

Value

Source; quality score; and other information

Interpretation

GUS leaching potential index

2.89

Calculated

High leachability

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

Value

2.85 X 10^-01

Calculated

Note

Potential for particle bound transport index

Medium

Calculated

Potential for loss via drain flow

Moderately mobile

Calculated

Bio-concentration factor

BCF (l kg⁻¹)

Low risk

Low potential

CT₅₀ (days)

Known soil and groundwater metabolites

None

Other known metabolites

Metabolite name and reference

Aliases

Formation medium / Rate

Estimated maximum occurrence fraction

Metabolising enzymes

phosphoric acid

ECOTOXICOLOGY

Terrestrial ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

> 5000

Rat

Low

Mammals - Short term dietary NOEL

(mg kg⁻¹)

(ppm diet)

Mammals - Chronic 21d NOAEL (mg kg⁻¹ bw d⁻¹)

> 1997

Unknown species Reproductive NOAEL

Low

Birds - Acute LD₅₀ (mg kg⁻¹)

> 2250

Colinus virginianus as phosphonic acid

Low

Birds - Short term dietary (LC₅₀/LD₅₀)

> 5620 mg kg feed⁻¹

Colinus virginianus as phosphonic acid

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

149.04

Colinus virginianus NOEC

Moderate

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

> 1000

Eisenia foetida as phosphonic acid

Low

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

182.5

Eisenia foetida as phosphonic acid

Low

Soil micro-organisms

Nitrogen mineralisation: Minor transient effects
Carbon mineralisation: Minor transient effects

Dose: up to 26.99 mg posphonic acid/kg soil 28 days

Collembola

Acute LC₅₀ (mg kg⁻¹)

Chronic NOEC (mg kg⁻¹)

Non-target plants

Honeybees (Apis 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)

> 145

as potassium phosphonates

Low

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

Chronic

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 pollinators (1)

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

Mode of exposure

Other pollinators (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) as % Mortality at dose 2.02 kg ha⁻¹

12.82

Alphidius rhopalosiphi as phosphonic acid

Beneficial insects (Predatory mites) as % Mortality at dose 2.02 kg ha⁻¹

10.8

Typhlodromus pyri as phosphonic acid

Beneficial insects (Ground beetles)

Aquatic ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

> 118

Oncorhynchus mykiss as phosphonic acid

Low

Fish - Chronic 21 day NOEC (mg l⁻¹)

100

Oncorhynchus mykiss as phosphonic acid

Low

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

> 118

Daphnia magna as phosphonic acid

Low

Aquatic invertebrates - Chronic 21 day NOEC (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)

100

Chironmus riparius as phosphonic acid

Low

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

Aquatic plants - Acute 7 day EC₅₀, biomass (mg l⁻¹)

Algae - Acute 72 hour EC₅₀, growth (mg l⁻¹)

Algae - Chronic 96 hour NOEC, growth (mg l⁻¹)

146.7

Scenedesmus subspicatus as phosphonic acid

Low

Mesocosm study data

NOEAEC mg l⁻¹

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

Low

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

4000

Rat

Mammals - Inhalation LC₅₀ (mg l⁻¹)

> 5.05

Rat

Other Mammal toxicity endpoints

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

2,25

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)

5.0

Dermal penetration studies (%)

100

default

Dangerous Substances Directive 76/464

Exposure Routes

Public

Negligible risks identified for proposed uses

Occupational

Negligible risks identified for proposed uses

MRLs

European

EU MRL pesticide database

Great Britain

GB MRL Register

Notes

Drinking Water Standards

Drinking Water MAC (μg l⁻¹)

10.5

Mammalian dose elimination route and rate

Health issues

Specific human health issues

Carcinogen

Genotoxic

Endocrine disruptor

; ; ; ;

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 further information available

Handling issues

Property

Value and interpretation

General

Not oxisiding or explosive
Not expected to autoignite; Not highly flammable

CLP classification 2013

None allocated at this time

WHO Classification

NL (Not listed)

UN Number

Waste disposal & packaging

TRANSLATIONS

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Name

English

potassium phosphonates

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Record last updated:	24/01/2023
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