butachlor (Ref: CP 53619) ** amichlor ** CP 53619 ** rasayanchlor ** Translations

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GENERAL INFORMATION

Description: A herbicide used for pre-emergence control of annual grasses and some broad-leaved weeds particularly in rice crops

Introduction: circa 1970

EC Directive 1107/2009 (repealing 91/414):

Status	Excluded from Annex 1
Dossier rapporteur/co-rapporteur	-
Date inclusion expires	Not applicable

Approved for use () or known to be used () in the following European countries:

AT

BE

BG

CY

CZ

DE

DK

EE

EL

ES

FI

FR

HU

IE

IT

LT

LU

LV

MT

NL

PL

PT

RO

SE

SI

SK

UK

General status:

Pesticide type	Herbicide
Substance group	Chloroacetamide
Substance origin	Synthetic
Mode of action	Selective, systemic absorbed primarily via germinating shoots. Inhibition of mitosis and cell division.
CAS RN	23184-66-9
EC number	245-477-8
CIPAC number	354
US EPA chemical code	112301
Chemical formula	C17H26ClNO2
SMILES	CCCCOCN(C1=C(C=CC=C1CC)CC)C(=O)CCl
International Chemical Identifier (InChI)	InChI=1/C17H26ClNO2/c1-4-7-11-21-13-19(16(20)12-18)17-14(5-2)9-8-10-15(17)6-3/h8-10H,4-7,11-13H2,1-3H3
Structure diagram/image available?	Yes
Molecular mass (g mol-1)	311.9
IUPAC Name	N-butoxymethyl-2-chloro-2',6'-diethylacetanilide
CAS Name	N-(butoxymethyl)-2-chloro-N-(2,6-diethylphenyl)acetamide
Other status information	-
Herbicide Resistance Classification (HRAC)	K3
Insecticide Resistance Classification (IRAC)	Not applicable
Fungicide Resistance Classification (FRAC)	Not applicable
Physical state	Oily liquid of variable colour
Related substances & organisms	-

Formulations:

Property	Value
Example manufacturers of products using this active	Monsanto FCC King Tech Corp
Example products using this active	Machete Weedout Butanox Vendaval
UK LERAP status	No UK approval for use or outside scope
Formulation and application details	Usually supplied as an emulsifiable concentrate or as granules.

ENVIRONMENTAL FATE

Property		Value	Source/Quality Score/Other Information	Interpretation
Solubility - In water at 20oC (mg l-1)		20	H4	Low
Solubility - In organic solvents at 20oC (mg l-1)		-	-	-
Melting Point (oC)		-0.55	L3	-
Boiling Point (oC)		156	L3	-
Degradation point (oC)		165	L3	-
Flashpoint (oC)		Not highly flammable	L3	-
Octanol-water partition coefficient at pH 7, 20oC	P	3.16 X 1004	Calculated	-
	Log P	4.5	CA3	High
Bulk density (g ml-1)/Specific gravity		1.08	L3	-
Dissociation constant (pKa) at 25oC		-	-	-
		Note:
Vapour pressure at 25oC (mPa)		0.24	L3	Non-volatile
Henry's law constant at 25oC (Pa m3 mol-1)		3.74 X 10-03	L3	Non-volatile
Henry's law constant at 20oC (dimensionless)		1.54 X 10-06	Calculated	Moderately volatile
GUS leaching potential index		2.02	Calculated	Transition state
SCI-GROW groundwater index (µg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate	Value	8.11 X 10-02	Calculated	-
	Note	-
Potential for particle bound transport index		-	Calculated	Medium
Maximum UV-vis absorption L mol-1 cm-1		-	-	-
Surface tension (mN m-1)		-	-	-

Degradation:

Property		Value	Source/Quality Score/Other Information	Interpretation
Soil degradation (days) (aerobic)	DT50 (typical)	56	L3	Moderately persistent
	DT50 (lab at 20oC)	-	-	-
	DT50 (field)	11.5	R4	Non-persistent
	DT90 (lab at 20oC)	-	-	-
	DT90 (field)	-	-	-
	Note	General literature states DT50 4 days to 18 days (R4)
Aqueous photolysis DT50 (days) at pH 7	Value	-	-	-
	Note	-
Aqueous hydrolysis DT50 (days) at 20oC and pH 7	Value	-	-	-
	Note	-
Water-Sediment DT50 (days)		-	-	-
Water phase only DT50 (days)		-	-	-

Soil adsorption and mobility:

Property		Value	Source/Quality Score/Other Information	Interpretation
Linear	Kd	-	H3	Slightly mobile
	Koc	700
	Notes and range	Best available data
Freundlich	Kf	-	-	-
	Kfoc	-
	1/n	-
	Notes and range	-
pH sensitivity		-

ECOTOXICOLOGY

Property		Value	Source/Quality Score/Other Information	Interpretation
Bio-concentration factor	BCF	2.4	J4 Low risk	Low potential
	CT50 (days)	Not available		-
Bioaccumulation potential		-	Calculated	Low
Mammals - Acute oral LD50 (mg kg-1)		2000	L3 Rat	Moderate
Mammals - Short term dietary NOEL	(mg kg-1)	-	-	-
	(ppm diet)	-		-
Birds - Acute LD50 (mg kg-1)		4640	L3 Anas platyrhynchos	Low
Birds - Short term dietary (LC50/LD50)		-	-	-
Fish - Acute 96 hour LC50 (mg l-1)		0.44	L3 Lepomis macrochirus	Moderate
Fish - Chronic 21 day NOEC (mg l-1)		-	-	-
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1)		2.4	L3 Daphnia magna	Moderate
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1)		-	-	-
Aquatic crustaceans - Acute 96 hour LC50 (mg l-1)		0.19	F3 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)		-	-	-
Algae - Acute 72 hour EC50, growth (mg l-1)		0.2	F4 Scenedesmus quadricauda	Moderate
Algae - Chronic 96 hour NOEC, growth (mg l-1)		-	-	-
Honeybees - Acute 48 hour LD50 (µg bee-1)		100	L3 Contact	Moderate
Earthworms - Acute 14 day LC50 (mg kg-1)		-	-	-
Earthworms - Chronic 14 day NOEC, reproduction (mg kg-1)		-	-	-
Other soil macro-organisms - e.g. Collembola	LR50product ha EC50product ha NOECproduct ha % 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

General:

Property		Value	Source/Quality Score/Other Information	Interpretation
Mammals - Acute oral LD50 (mg kg-1)		2000	L3 Rat	Moderate
Mammals - Dermal LD50 (mg kg-1 body weight)		> 13000	L3 Rat	-
Mammals - Inhalation LC50 (mg l-1)		3.34	L3 Rat	-
Other Mammal toxicity endpoints		-		-
ADI - Acceptable Daily Intake (mg kg-1bw day-1)		-	-	-
ARfD - Acute Reference Dose (mg kg-1bw 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	-
	Occupational	[Occupational exposure may occur through dermal contact]
Examples of European MRLs (mg kg-1)	Value	-
	Note	For the EU pesticides database click here
Drinking Water MAC (µg l-1)		-	-	-

Health issues:

Carcinogen	Mutagen	Endocrine disrupter	Reproduction / development effects	Acetyl cholinesterase inhibitor	Neurotoxicant	Respiratory tract irritant	Skin irritant	Eye irritant
	-	-	-		-	-	-	-
General human health issues		[No further information available]

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

Handling issues:

Property		Value	Source/Quality Score/Other Information	Interpretation
General		[No information available]
EC Risk Classification		-
EC Safety Classification		-
WHO Classification		III	-	Slightly hazardous
US EPA Classification (formulation)		III	-	Caution - Slightly toxic
UN Number		-
Waste disposal & packaging		-

TRANSLATIONS