Alachlor (Ref: CP 50144 )-Pesticide database

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Alachlor (Ref: CP 50144 )

(Also known as: alachlore; acetanilide; methachlor; metachlor; CDMA)

Alachlor is a pre-emergence chloroacetanilide herbicide. It is moderately soluble in water, quite volatile and is not expected to readily leach to groundwater. It tends not to persist in either soil or water systems. It has a moderate mammalian toxicity and a low potential for bioaccumulation. Alachlor is moderately toxic to birds, most aquatic organisms, honeybees and earthworms.

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: Moderately mobile; Potential for particle bound transport: Medium	Ecotoxicity Moderate alert: Birds acute ecotoxicity: Moderate; Fish acute ecotoxicity: Moderate; Fish chronic ecotoxicity: Moderate; Daphnia acute ecotoxicity: Moderate; Daphnia chronic ecotoxicity: Moderate; Bees acute contact ecotoxicity: Moderate; Earthworms acute ecotoxicity: Moderate	Human health Moderate alert: Mammals acute toxicity: Moderate; Possible Carcinogen; Possible Endocrine distrupter; Possible Reproduction/development effects

GENERAL INFORMATION

A chloroacetanilide herbicide for pre-emergence control of annual grasses and broad-leaved weeds

Example pests controlled

Goosegrass; Crab grass; Herringbone grass; Sweet buffalo grass; Barnyard grass; Nutsedge; Pigweed; Sow thistle; Purslane; Chickweed

Example applications

Maize; Potatoes; Soybean; Sunflowers; Brassicas; Pineapples; Sugarcane

Efficacy & activity

Availability status

Introduction & key dates

UK regulatory status

UK COPR regulatory status

Date COPR inclusion expires

UK LERAP status

No UK approval for use

EC Regulation 1107/2009 (repealing 91/414)

EC Regulation 1107/2009 status

Dossier rapporteur/co-rapporteur

Date EC 1107/2009 inclusion expires

EU Candidate for substitution (CfS)

Listed in EU database

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

Chemical structure

Chemical formula

C₁₄H₂₀ClNO₂

Canonical SMILES

CCC1=C(C(=CC=C1)CC)N(COC)C(=O)CCl

Isomeric SMILES

International Chemical Identifier key (InChIKey)

XCSGPAVHZFQHGE-UHFFFAOYSA-N

International Chemical Identifier (InChI)

InChI=1S/C14H20ClNO2/c1-4-11-7-6-8-12(5-2)14(11)16(10-18-3)13(17)9-15/h6-8H,4-5,9-10H2,1-3H3

2D structure diagram/image available?

Cambridge Crystallographic Data Centre diagrams

Common Name	Relationship	Link
alachlor	-

Substance groups

Chloroacetanilide herbicide

Minimum active substance purity

Known relevant impurities

Substance origin

Selective, systemic action absorbed by germinating shoots. Inhibition of VLCFA (inhibition of cell division)

US EPA chemical code

CLP index number

PIN (Preferred Identification Name)

2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide

2-chloro-2',6'-diethyl-N-methoxymethylacetanilide

2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide

Other status information

WFD priority substance; OSPAR candidate; Potential groundwater contaminant; Chemical subject to PIC regulations; PAN Bad Actor

Relevant Environmental Water Quality Standards

EU Directive 2008/105/EC EQS surface waters: annual average 0.3 µg l⁻¹; max measured 0.7 µg l⁻¹

Herbicide Resistance Classification (HRAC)

Herbicide Resistance Classification (WSSA)

Insecticide Resistance Classification (IRAC)

Fungicide Resistance Classification (FRAC)

Examples of recorded resistance

Colourless/yellow crystals

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

Monsanto
Makhteshim-Agan
Pillar International

Example products using this active

Lasso
Alanex
Pillarzo
Bullet
Cannon
Bronco

Formulation and application details

Usually supplied as emulsifiable concentrates, microscopic capsules and granules

ENVIRONMENTAL FATE

Source; quality score; and other information

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

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

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

Melting point (°C)

L3 L = Pesticide manuals and hard copy reference books / other sources
3 = Unverified data of known source

Boiling point (°C)

V3 V = ChemID Online Databases; Chemspider; PubChem. (ChemID )
3 = Unverified data of known source

Degradation point (°C)

L3 L = Pesticide manuals and hard copy reference books / other sources
3 = Unverified data of known source

Flashpoint (°C)

L3 L = Pesticide manuals and hard copy reference books / other sources
3 = Unverified data of known source

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

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

Fat solubility of residues

Density (g ml⁻¹)

L3 L = Pesticide manuals and hard copy reference books / other sources
3 = Unverified data of known source

Dissociation constant pKa) at 25 °C

Q3 Q = Miscellaneous data from online sources
3 = Unverified data of known source

Vapour pressure at 20 °C (mPa)

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

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

L3 L = Pesticide manuals and hard copy reference books / other sources
3 = Unverified data of known source

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

Surface tension (mN m⁻¹)

Source; quality score; and other information

General biodegradability

Soil degradation (days) (aerobic)

DT₅₀ (typical)

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

DT₅₀ (lab at 20 °C)

Q2 Q = Miscellaneous data from online sources
2 = Unverified data of unknown source

Moderately persistent

DT₅₀ (field)

B4 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
4 = Verified data

DT₉₀ (lab at 20 °C)

DT₉₀ (field)

DT₅₀ modelling endpoint

Field studies DT₅₀ range 1-3 weeks; Other sources: DT₅₀ 80 days (R2)

Dissipation rate RL₅₀ on plant matrix

Dissipation rate RL₅₀ on and in plant matrix

Aqueous photolysis DT₅₀ (days) at pH 7

K3 K = Research datasets (e.g. Pandora, Demetra; these datasets no longer available). Norman Ecotoxicology database. (click here )
3 = Unverified data of known source

Stable to UV light

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

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

Water-sediment DT₅₀ (days)

B4 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
4 = Verified data

Water phase only DT₅₀ (days)

Soil adsorption and mobility

Source; quality score; and other information

R3 R = Peer reviewed scientific publications
3 = Unverified data of known source

Moderately mobile

Notes and range

R4 R = Peer reviewed scientific publications
4 = Verified data

Slightly mobile

Notes and range

Literature values: K_f range 11.8-20.5 mL g⁻¹; K_foc range 339-4214 mL g⁻¹, ¹/_n range 0.70-0.91, Soils = 5

Source; quality score; and other information

GUS leaching potential index

Low leachability

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

Potential for particle bound transport index

Potential for loss via drain flow

Moderately mobile

Bio-concentration factor

BCF (l kg⁻¹)

P4 P = Other non-EU, UK or US Governments and Regulators
4 = Verified data

CT₅₀ (days)

Known soil metabolites

Major/Minor fraction

Estimated maximum occurrence fraction

alachlor ethane sulphonate

alachlor oxanilic acid

Known groundwater metabolites

None

Other known metabolites

None

Terrestrial ecotoxicology

Source; quality score; and other information

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment )
4 = Verified data

Mammals - Short term dietary NOEL

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

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

Birds - Acute LD₅₀ (mg kg⁻¹)

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

Colinus virginianus

Birds - Short term dietary (LC₅₀/LD₅₀)

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

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

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

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

Soil micro-organisms

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)

K4 K = Research datasets (e.g. Pandora, Demetra; these datasets no longer available). Norman Ecotoxicology database. (click here )
4 = Verified data

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

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 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)

Aquatic ecotoxicology

Source; quality score; and other information

Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

Oncorhynchus mykiss

Fish - Chronic 21 day NOEC (mg l⁻¹)

P3 P = Other non-EU, UK or US Governments and Regulators
3 = Unverified data of known source

Unknown species

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

F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment )
4 = Verified data

Daphnia magna

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

P3 P = Other non-EU, UK or US Governments and Regulators
3 = Unverified data of known source

Unknown species

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 - Acute 7 day EC₅₀, biomass (mg l⁻¹)

F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment )
3 = Unverified data of known source

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

F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment )
4 = Verified data

Scenedesmus quadricauda

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

J3 J = Pesticide Action Network database (click here )
3 = Unverified data of known source

Chlorella pyrenoidosa

Mesocosm study data

NOEAEC mg l⁻¹

NOEAEC mg l⁻¹

HUMAN HEALTH AND PROTECTION

Source; quality score; and other information

Threshold of Toxicological Concern (Cramer Class)

High (class III)

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents / FAO data, IPCS INCHEM data (US EPA Databases Related to Pesticide Risk Assessment )
4 = Verified data

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

L3 L = Pesticide manuals and hard copy reference books / other sources
3 = Unverified data of known source

Mammals - Inhalation LC₅₀ (mg l⁻¹)

L3 L = Pesticide manuals and hard copy reference books / other sources
3 = Unverified data of known source

Other Mammal toxicity endpoints

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

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

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

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

Dermal penetration studies (%)

Dangerous Substances Directive 76/464

Exposure Routes

Low risk to Europeans as no longer approved for use

Occupational exposure may occur through inhalation and dermal contact

EU MRL pesticide database

GB MRL Register

Drinking Water Standards

Non-statutory WHO drinking water guideline 0.02 mg l⁻¹

B5 B = UK CRD and ACP Evaluation Documents / and other DEFRA (UK) documents; Also Chemicals Regulation Division, Health and Safety Executive (HSE), UK (click here )
5 = Verified data used for regulatory purposes

UK EA QS database 2018

Drinking Water MAC (μg l⁻¹)

Mammalian dose elimination route and rate

Specific human health issues

Endocrine disruptor

?Possibly, status not identified

A3 A = Chromosome aberration (EFSA database)
3 = Negative

B0 B = DNA damage/repair (EFSA database)
0 = No data

C0 C = Gene mutation (EFSA database)
0 = No data

D0 D = Genome mutation (EFSA database)
0 = No data

E3 E = Unspecified genotoxicity type (miscellaneous data source)
3 = Negative

?Possibly, status not identified

Reproduction / development effects

Acetyl cholinesterase inhibitor

?Possibly, status not identified

XNo, known not to cause a problem

XNo, known not to cause a problem

Respiratory tract irritant

Skin sensitiser

XNo, known not to cause a problem

?Possibly, status not identified

?Possibly, status not identified

✓Yes, known to cause a problem

General human health issues

US Toxics Release Inventory (TRI) Program listed carcinogen
Probable lung and kidney toxicant
Causes irreversible eye damage
Possibly genotoxic
Endocrine issues - Competitive binding to estrogen and progesterone receptors

Handling issues

Value and interpretation

Corrosive
IMDG Transport Hazard Class 9

CLP classification 2013

Health: H302, H317, H351
Environment: H400, H410

WHO Classification

II (Moderately hazardous)

Waste disposal & packaging

Packaging Group III (minor danger)

Shelf-life, storage, stability and reactivity

Chemically stable under standard ambient conditions

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