Triasulfuron (Ref: CGA 131036 )

Triasulfuron (Ref: CGA 131036 )	Last updated: 11/01/2021
(Also known as: triazsulfuron)

GENERAL INFORMATION

Description

A herbicide for annual broad-leaved weed control in cereals and for other weed clearing activities

Example pests controlled

Annual ryegrass; Paradoxa grass; Timothy; Wild radish; Deadnettles; Hedge mustard; Rough poppy; Wild turnip; Bermudagrass; Smooth brome

Example applications

Cereals including wheat, oats, barley; Non-crop areas including rangeland, roadsides, railways, industrial sites, paths, rights-of-way

Efficacy & activity

Availability status

Current

Introduction & key dates

circa 1985

UK regulatory status

UK COPR regulatory status

Not Approved

Date COPR inclusion expires

Expired

UK LERAP status

No UK approval for use

EC Regulation 1107/2009 (repealing 91/414)

EC Regulation 1107/2009 status

Not Approved

Dossier rapporteur/co-rapporteur

France/Denmark

Date EC 1107/2009 inclusion expires

Expired

EU Candidate for substitution (CfS)

Not applicable

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
				✓

Also used in

Chemical structure

Isomerism

Chemical formula

C₁₄H₁₆ClN₅O₅S

Canonical SMILES

CC1=NC(=NC(=N1)OC)NC(=O)NS(=O)(=O)C2=CC=CC=C2OCCCl

Isomeric SMILES

No data

International Chemical Identifier key (InChIKey)

XOPFESVZMSQIKC-UHFFFAOYSA-N

International Chemical Identifier (InChI)

InChI=1S/C14H16ClN5O5S/c1-9-16-12(19-14(17-9)24-2)18-13(21)20-26(22,23)11-6-4-3-5-10(11)25-8-7-15/h3-6H,7-8H2,1-2H3,(H2,16,17,18,19,20,21)

2D structure diagram/image available?

Yes

General status

Pesticide type

Herbicide

Substance group

Sulfonylurea

Minimum active substance purity

940 g kg⁻¹

Known relevant impurities

EU dossier - None declared

Substance origin

Synthetic

Mode of action

Selective, absorbed by leaves and roots and translocated. Inhibits plant amino acid synthesis - acetohydroxyacid synthase AHAS

CAS RN

82097-50-5

EC number

CIPAC number

480

US EPA chemical code

128969

PubChem CID

73282

Molecular mass

401.8

PIN (Preferred Identification Name)

2-(2-chloroethoxy)-N-[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)carbamoyl]benzene-1-sulfonamide

IUPAC name

1-[2-(2-chloroethoxy)phenylsulfonyl]-3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)urea

CAS name

2-(2-chloroethoxy)-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide

Other status information

Relevant Environmental Water Quality Standards

Herbicide Resistance Classification (HRAC)

Herbicide Resistance Classification (WSSA)

Insecticide Resistance Classification (IRAC)

Not applicable

Fungicide Resistance Classification (FRAC)

Not applicable

Examples of recorded resistance

Lolium multiflorum, Lolium rigidum

Physical state

White powder

Formulations

Property

Value

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

Usually supplied as wettable granules for foliar application

Example products using this active

Syngenta
Titan Ag
Logran

Formulation and application details

ENVIRONMENTAL FATE

Property

Value

Source; quality score; and other information

Interpretation

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

815

High

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

n-Hexane

300

Toluene

14000

Acetone

4300

Ethyl acetate

Melting point (°C)

188.6

Boiling point (°C)

Decomposes before boiling

Degradation point (°C)

178.1

Flashpoint (°C)

Not expected to self ignite; Not highly flammable

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

2.57 X 10^-01

Calculated

Log P

-0.59

Low

Bulk density (g ml⁻¹)

1.47

Dissociation constant pKa) at 25 °C

4.64

Weak acid

Vapour pressure at 20 °C (mPa)

0.0021

Low volatility

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

8.00 X 10^-05

Non-volatile

Maximum UV-vis absorption L mol⁻¹ cm⁻¹

223.4nm = 26051, 282.8nm = 3415, shoulder between 240-250nm, no absorption after 340nm

Surface tension (mN m⁻¹)

63.9

Degradation

Property

Value

Source; quality score; and other information

Interpretation

General biodegradability

Soil degradation (days) (aerobic)

DT₅₀ (typical)

59.1

Moderately persistent

DT₅₀ (lab at 20 °C)

59.1

Moderately persistent

DT₅₀ (field)

38.5

Moderately persistent

DT₉₀ (lab at 20 °C)

178.5

Persistent

DT₉₀ (field)

112.2

DT₅₀ modelling endpoint

Note

EU dossier lab studies DT₅₀ range 20.7-118 days, DT₉₀ range 68.8-243.3 days, field studies DT₅₀ range 16.1-92.4 days, DT₉₀ range 53.5-198 days; Other sources: 60 days (DW4)

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

Stable

Note

Not a significant degradation route, light has little effect

Aqueous hydrolysis DT₅₀ (days) at 20 °C and pH 7

Value

Stable

Note

pH sensitive: DT₅₀ 23 days at pH 5, stable at pH 7 and pH 9, all at 22 °C

Water-sediment DT₅₀ (days)

217

Slow

Water phase only DT₅₀ (days)

217

Stable

Soil adsorption and mobility

Property

Value

Source; quality score; and other information

Interpretation

Linear

K_d

Mobile

K_oc

Notes and range

Freundlich

K_f

0.49

Very mobile

K_foc

12.8

¹/_n

0.850

Notes and range

EU dossier 2014 K_f=0.05-2.65 mL g⁻¹, K_foc range 7-25 mL g⁻¹; Literature data: K_f range 0.46-6.34 mL g⁻¹, K_foc range 43.5-171 mL g⁻¹, ¹/_n range 0.68-0.88, soils = 3 (R4)

pH sensitivity

Fate indices

Property

Value

Source; quality score; and other information

Interpretation

GUS leaching potential index

4.59

Calculated

High leachability

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

Value

1.85 X 10⁰⁰

Calculated

Note

Potential for particle bound transport index

Medium

Calculated

Potential for loss via drain flow

Mobile

Calculated

Key metabolites

Metabolite

Formation medium

Estimated maximum occurrence fraction

1107/2009 relevancy

2-amino-4-methoxy-6-methyl-1,3,5-triazine (Ref: IN-A4098)

Soil

0.267

Major fraction, Relevant

O-demethyl triasulfuron (Ref: CGA 195660)

Soil

0.227

Major fraction, Relevant

N-((N-carbamoylcarbamimidoyl)carbamoyl)-2-(2-chloroethoxy)benzenesulfonamide (Ref: SYN546702)

Soil

0.169

Major fraction, Relevant

Other known metabolites

Metabolite name and reference

Aliases

Formation medium / Rate

Estimated maximum occurrence fraction

Metabolising enzymes

chlorosulfonamide

Soil (Photolysis); Water

hydroxy chlorosulfonamide

Soil (Photolysis)

ECOTOXICOLOGY

Property

Value

Source; quality score; and other information

Interpretation

Bio-concentration factor

BCF (l kg⁻¹)

1.3

Whole fish

Low potential

CT₅₀ (days)

Not available

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

> 5000

Rat

Low

Mammals - Short term dietary NOEL

(mg kg⁻¹)

Rat

(ppm diet)

> 1000

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

Birds - Acute LD₅₀ (mg kg⁻¹)

> 2150

Colinus virginianus

Low

Birds - Short term dietary (LC₅₀/LD₅₀)

> 5000 mg kg feed⁻¹

Colinus virginianus

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

Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

> 100

Oncorhynchus mykiss

Low

Fish - Chronic 21 day NOEC (mg l⁻¹)

36.6

Oncorhynchus mykiss

Low

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

> 100

Daphnia magna

Low

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

Daphnia magna

Moderate

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

17.2

Americamysis bahia

Moderate

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 - Acute 7 day EC₅₀, biomass (mg l⁻¹)

0.000068

Lemna gibba

High

Non-target plants

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

0.035

Raphidocelis subcapitata 12 day

Moderate

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

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)

100

Moderate

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

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

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

> 1000

Low

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

Other soil macro-organisms

Acute LC₅₀ (mg kg⁻¹)

Chronic NOEC (mg kg⁻¹)

Other arthropod (1)

LR₅₀ g ha⁻¹

% Effect

26.2

Beneficial capacity [Dose: 0.025 kg ha⁻¹]
Aphidius rhopalosiphi

Other arthropod (2)

LR₅₀ g ha⁻¹

% Effect

3.1

Beneficial effect [Dose: 0.025kg ha⁻¹]
Typhlodromus pyri

Soil micro-organisms

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

Dose: 0.25 kg ha⁻¹

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)

2000

Rat

Mammals - Inhalation LC₅₀ (mg l⁻¹)

> 5.2

Rat

Other Mammal toxicity endpoints

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

0.01

Mouse SF=100

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)

0.3

Dog 1 year SF=100

Dermal penetration studies (%)

0.03-3.0

concentration dependent

Dangerous Substances Directive 76/464

Exposure Routes

Public

No unacceptable risks to bystanders identified

Occupational

No unacceptable risks to operators or other workers identified

European MRLs

EU MRL pesticide database

Drinking Water Standards

Drinking Water MAC (μg l⁻¹)

Health issues

Specific human health issues

Carcinogen

Genotoxic

Endocrine disruptor

; ; ; ;

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

Possible blood and liver toxicant

Handling issues

Property

Value and interpretation

General

IMDG Transport Code is usually 9

CLP classification 2013

Environment: H400, H410

EC Risk Classification

N - Dangerous for the environment: R50, R53

EC Safety Classification

S60, S61

WHO Classification

U (Unlikely to present an acute hazard)

UN Number

Usually 3077

Waste disposal & packaging

Packaging Group III (minor danger)

TRANSLATIONS

Language

Name

English

triasulfuron

French

triasulfuron

German

Triasulfuron

Danish

triasulfuron

Italian

triasulfuron

Spanish

triasulfuron

Greek

triasulfuron

Polish

triasulfuron

Swedish

Hungarian

triaszulfuron

Dutch

triasulfuron

Record last updated:	11/01/2021
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