Select Option
Home
A to Z
Search
Terms & Conditions
Support Information
Purchasing & Other Services
Video User Guides
GET ADDITIONAL DATA HERE!

alachlor (Ref: CP 50144 )
** alachlore ** acetanilide ** methachlor ** metachlor ** CDMA ** Translations

Environmental Fate - Ecotoxicology - Human Health - A to Z Index - Home

SUMMARY

Alachlor is a pre-emergence chloroacetanilide herbicide that is not approved for use in the EU. 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.

GENERAL INFORMATION Click here for an explantaion of the general chemical status information
for alachlor

Description: 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: Current

Introduction & key dates: 1969

EC Regulation 1107/2009 (repealing 91/414):
Status Not approved
Dossier rapporteur/co-rapporteur Spain
Date inclusion expires Expired
EU Candidate for substitution (CfS) -
Listed in EU database Yes

Approved for use () or known to be used () in the following European countries: Click to access a note on the approvals information on this site

AT

BE

BG

CY

CZ

DE

DK

EE

EL

ES

FI

FR

HR

HU

IE

IT

LT

LU

LV

MT

NL

PL

PT

RO

SE

SI

SK

UK

Also used in: USA; Japan

Chemical structure: Click here for further information on the general chemical status information used on this site
Isomerism None
Chemical formula C14H20ClNO2
Canonical SMILES CCC1=C(C(=CC=C1)CC)N(COC)C(=O)CCl
Isomeric SMILES No data
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? Yes

Click to access the Cambridge Crystallographic Data Centre (CCDC) website
Cambridge Crystallographic Data Centre diagrams:
Common Name Relationship Link
Alachlor - Click here for the CCDC structure diagram

General status: Click here for further information on the general chemical status information used on this site
Pesticide type Herbicide
Substance group Chloroacetamide
Minimum active substance purity -
Known relevant impurities -
Substance origin Synthetic
Mode of action Selective, systemic action absorbed by germinating shoots. Inhibition of VLCFA (inhibition of cell division)
CAS RN 15972-60-8
EC number 240-110-8
CIPAC number 204
US EPA chemical code 090501
PubChem CID 2078
Molecular mass (g mol-1) 269.77
PIN (Preferred Identification Name) 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide
IUPAC name 2-chloro-2',6'-diethyl-N-methoxymethylacetanilide
CAS name 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
Relevant Environmental Water Quality Standards EU Directive 2008/105/EC EQS surface waters: annual average 0.3 ug/L; max measured 0.7 ug/L
Herbicide Resistance Classification (HRAC) K3
Herbicide Resistance Classification (WSSA) 15
Insecticide Resistance Classification (IRAC) Not applicable
Fungicide Resistance Classification (FRAC) Not applicable
Examples of recorded resistance -
Physical state Colourless/yellow crystals
Related substances & organisms -

Formulations:
Property Click here for information on the general product and branding information used on this site Value
Example manufacturers & suppliers of products using this active now or historically
  • Monsanto
  • Makhteshim-Agan
  • Pillar International
Example products using this active
  • Lasso
  • Alanex
  • Pillarzo
UK LERAP status No UK approval for use as a pesticide under EC Regulation 1107/2009
Formulation and application details Usually supplied as emulsifiable concentrates, microscopic capsules and granules.


ENVIRONMENTAL FATE

for alachlor

Property Click here for information on the parameters used to describe environmental fate on this site Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with fate data Interpretation Click here for information on the way in which we interpret environmental fate data
Solubility - In water at 20oC (mg l-1) 240 B5 Moderate
Solubility - In organic solvents at 20oC (mg l-1) - - -
Melting point (oC) 41 L3 -
Boiling point (oC) 100 V3 -
Degradation point (oC) 105 L3 -
Flashpoint (oC) 137 L3 - (closed cup) -
Octanol-water partition coefficient at pH 7, 20oC P 1.23 X 1003 Calculated -
Log P 3.09 B5 High
Bulk density (g ml-1)/Specific gravity 1.13 L3 -
Dissociation constant (pKa) at 25oC 0.62 Q3 -
Note: Strong acid
Vapour pressure at 20oC (mPa) 2.9 B5 Low volatility
Henry's law constant at 25oC (Pa m3 mol-1) 3.20 X 10-03 L3 Non-volatile
GUS leaching potential index Click here for a note on the limitations of the GUS index 1.08 Calculated Low leachability
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate Click here for a note on the limitations of the SCI-GROW index Value 2.18 X 10-02 Calculated -
Note -
Potential for particle bound transport index Click here for a note on the limitations of the potential for particle bound transport index - Calculated Medium
Maximum UV-vis absorption L mol-1 cm-1 - - -
Surface tension (mN m-1) - - -

Degradation:
Property Click here for information on the parameters used to describe substance degradation Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with degradation data Interpretation Click here for information on the way in which we interpret substance degradation data
General biodegradability -
Soil degradation (days) (aerobic) DT50 (typical) 14 B5 Non-persistent
DT50 (lab at 20oC) 35 Q2 Moderately persistent
DT50 (field) 14 B4 Non-persistent
DT90 (lab at 20oC) - - -
DT90 (field) - - -
DT50 modelling endpoint - - -
Note Field studies DT50 range 1-3 weeks; Other sources: DT50 80 days (R2)
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 0.5 K3 Fast
Note Stable to UV light
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value 0.5 B5 Non-persistent
Note -
Water-sediment DT50 (days) 2 B4 Fast
Water phase only DT50 (days) - - -

Soil adsorption and mobility:
Property Click here for information on the parameters used to describe substance adsorption and mobility Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with adsorption and mobility data Interpretation Click here for information on the way in which we interpret substance adsorption and mobility
Linear Kd - R3 Moderately mobile
Koc 335
Notes and range -
Freundlich Kf 16.5 R4 Slightly mobile
Kfoc 1994
1/n 0.81
Notes and range Literature values: Kf range 11.8-20.5 mL/g; Kfoc range 339-4214 mL/g, 1/n range 0.70-0.91, Soils = 5
pH sensitivity -

Key metabolites:
Metabolite Formation medium Estimated maximum occurrence fraction 1107/2009 relevancy Click here for further information on 1107/2009 relevancy
alachlor ethane sulphonate Soil   -   -
alachlor oxanilic acid Soil   -   -
metolachlor ethane sulfonic acid (Ref: CGA 354743) Soil   -   -


ECOTOXICOLOGY

for alachlor

Property Click here for information on the parameters used to describe substance ecotoxicology Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with ecotoxicology data Interpretation Click here for information on the way in which we interpret substance ecotoxicology
Bio-concentration factor BCF (l kg-1) 39 P4 Low potential
CT50 (days) Not available -
Mammals - Acute oral LD50 (mg kg-1) 930 F4 Rat Moderate
Mammals - Short term dietary NOEL (mg kg-1) 10 B5 Rat High
(ppm diet) 200 -
Birds - Acute LD50 (mg kg-1) 1536 B5 Colinus virginianus Moderate
Birds - Short term dietary (LC50/LD50) - - -
Fish - Acute 96 hour LC50 (mg l-1) 1.8 B5 Oncorhynchus mykiss Moderate
Fish - Chronic 21 day NOEC (mg l-1) 0.19 P3 Unknown species Moderate
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 10 F4 Daphnia magna Moderate
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 0.22 P3 Unknown species Moderate
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) 0.01 F3 Lemna minor Moderate
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) 0.966 F4 Scenedesmus quadricauda Moderate
Algae - Chronic 96 hour NOEC, growth (mg l-1) 0.02 J3 Chlorella pyrenoidosa Moderate
Honeybees Contact acute 48 hour LD50 (μg bee-1) 16 K4 Moderate
Oral acute 48 hour LD50 (μg bee-1) - - -
Unknown mode acute 48 hour LD50 (μg bee-1) - - -
Earthworms - Acute 14 day LC50 (mg kg-1) 386.8 B5 Moderate
Earthworms - Chronic 14 day NOEC, reproduction (mg kg-1) - - -
Other soil macro-organisms - e.g. Collembola LR50 / EC50 / NOEC / % Effect - - -
Other arthropod (1) LR50 g ha-1 - - -
% Effect - - -
Other arthropod (2) LR50 g ha-1 - - -
% Effect - - -
Soil micro-organisms - - -
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for alachlor

General:
Property Click here for information on the parameters used to describe human health and protection issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with human health and protection data Interpretation Click here for information on the way in which we interpret human health and protection data
Threshold of Toxicological Concern (Cramer Class) Click here for a note on the limitations of the Cramer class High (class III) - -
Mammals - Acute oral LD50 (mg kg-1) 930 F4 Rat Moderate
Mammals - Dermal LD50 (mg kg-1 body weight) > 13300 L3 Rabbit -
Mammals - Inhalation LC50 (mg l-1) 1.04 L3 Rat -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.01 L3 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) - - -
AAOEL - Acute Acceptable Operator Exposure Level (mg kg-1 bw day-1) - - -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) - - -
Dermal penetration studies (%) - - -
Dangerous Substances Directive 76/464 - - -
Exposure Limits - - -
Exposure Routes Public Low risk to Europeans as no longer approved for use
Occupational Occupational exposure may occur through inhalation and dermal contact
European MRLs Click here for the EU MRL pesticide database
Drinking Water Standards Non-statutory WHO drinking water guideline 0.02 mg/L UK EA QS database, 2018 -
Drinking Water MAC (μg l-1) - - -

Health issues:
Carcinogen Mutagen Endocrine disrupter Reproduction / development effects Cholinesterase inhibitor Neurotoxicant

Respiratory tract irritant Skin irritant Skin sensitiser Eye irritant Phototoxicant

-

-

General human health issues Probable lung and kidney toxicant
Causes irreversible eye damage
Possibly genotoxic
Endocrine issues - Competitive binding to estrogen and progesterone receptors

: Yes, known to cause a problem
: No, known not to cause a problem
: Possibly, status not identified
- : No data found

Handling issues:
Property Click here for information on the parameters used to describe substance handling issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with data on handling issues Interpretation Click here for information on the way in which we interpret data on handling issues
General Click here for a description of the International Maritime Dangerous Goods (IMDG) codes Corrosive
CLP classification 2013 Health: H302, H317, H351
Environment: H400, H410
EC Risk Classification Click here to view information omn the EU risk phrases Carcinogen category 3: R40
Xn - Harmful: R22, R43
N - Dangerous for the environment: R50, R53
EC Safety Classification Click here to view information omn the EU safety phrases S2, S36/37, S46, S61, S60
WHO Classification II - Moderately hazardous
US EPA Classification (formulation) III - Caution - Slightly toxic
UN Number 2588
Waste disposal & packaging Click here for a description of UN packaging marks -


TRANSLATIONS

for alachlor

Language Name
English alachlor
French alachlore
German Alachlor
Danish alachlor
Italian alaclor
Spanish alacloro
Greek -
Slovenian alaklor
Polish alachlor
Swedish -
Hungarian alachlor
Dutch alachloor

Record last updated: Tuesday 30 October 2018
Contact: aeru@herts.ac.uk