| butachlor (Ref: CP 53619) |
 |
Environmental Fate - Ecotoxicology - Human Health - A to Z Index - Home
GENERAL INFORMATION 
for butachlor
Description: A herbicide used for pre-emergence control of annual grasses and some broad-leaved weeds particularly in rice crops
Example pests controlled: Barnyardgrass; Crab grass; Torpedo grass; Witchgrass; Red deadnettle
Example applications: Rice; Wheat; Barley; Peanuts
Availability status: Unknown
Introduction & key dates: circa 1970
EC Regulation 1107/2009 (repealing 91/414):
| Status | Not approved |
| Dossier rapporteur/co-rapporteur | Not applicable |
| 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 |
HR |
HU |
IE |
IT |
LT |
LU |
LV |
MT |
NL |
PL |
PT |
RO |
SE |
SI |
SK |
UK |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
General status:
| Pesticide type | Herbicide | |||
| Substance group | Chloroacetamide | |||
| Minimum active substance purity | - | |||
| Known relevant impurities | - | |||
| Substance origin | Synthetic | |||
| Mode of action | Selective, systemic absorbed primarily via germinating shoots. Inhibition of VLCFA (inhibition of cell division) | |||
| CAS RN | 23184-66-9 | |||
| EC number | 245-477-8 | |||
| CIPAC number | 354 | |||
| US EPA chemical code | 112301 | |||
| Chiral molecule | No | |||
| Chemical formula | C17H26ClNO2 | |||
| SMILES | CCCCOCN(C1=C(C=CC=C1CC)CC)C(=O)CCl | |||
| International Chemical Identifier key (InChIKey) | HKPHPIREJKHECO-UHFFFAOYSA-N | |||
| International Chemical Identifier (InChI) | InChI=1S/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 | |||
| PIN (Preferred Identification Name) | N-(butoxymethyl)-2-chloro-N-(2,6-diethylphenyl)acetamide | |||
| 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 | |||
| Herbicide Resistance Classification (WSSA) | 15 | |||
| Insecticide Resistance Classification (IRAC) | Not applicable | |||
| Fungicide Resistance Classification (FRAC) | Not applicable | |||
| Examples of recorded resistance | - | |||
| Physical state | Oily liquid of variable colour | |||
| Related substances & organisms | - | |||
Formulations:
| Property |
Value | |||
| Example manufacturers & suppliers of products using this active now or historically |
|
|||
| Example products using this active |
|
|||
| 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
for butachlor
| 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 expected to self ignite; 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 | Low volatility | |
| 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) | |||
| Plant matrix DT50 (days) | Value | - | - | - |
| Note | - | |||
| 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 | - | |||
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Bio-concentration factor | BCF (l kg-1) | 2.4 | J4 (Other literature Log BCF range -1.5-0.8 (R3)) | Low potential |
| CT50 (days) | 1.7 | - | ||
| 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) | - | - | - | |
| Non-target plants | - | - | - | |
| - | - | - | ||
| 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 | Contact acute 48 hour LD50 (μg bee-1) | > 100 | L3 | Low |
| Oral acute 48 hour LD50 (μg bee-1) | > 100 | L3 | Low | |
| Unknown mode acute 48 hour LD50 (μg bee-1) | - | - | - | |
| Earthworms - Acute 14 day LC50 (mg kg-1) | 0.515 | R4 Eisenia foetida | High | |
| 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 butachlor
General:
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Threshold of Toxicological Concern (Cramer Class) |
High (class III) | - | - | |
| 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 | |||
| European MRLs | Click here for the EU MRL pesticide database | |||
| 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 | USEPA - possible human carcinogen | |||||||
: Yes, known to cause a problem
: No, known not to cause a problem
: Possibly, status not identified
- : No data found
Handling issues:
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| General |
No information available | |||
| CLP classification 2013 | - | |||
| EC Risk Classification |
Xn - Harmful: R22 N - Dangerous for the environment: R50/53 |
|||
| EC Safety Classification |
S60, S61 | |||
| WHO Classification | III | - | Slightly hazardous | |
| US EPA Classification (formulation) | III | - | Caution - Slightly toxic | |
| UN Number | - | |||
| Waste disposal & packaging |
- | |||
| Language | Name |
| English | butachlor |
| French | butachlore |
| German | Butachlor |
| Danish | butachlor |
| Italian | butaclor |
| Spanish | butaclor |
| Greek | - |
| Slovenian | butaklor |
| Polish | butachlor |
| Swedish | - |
| Hungarian | - |
| Dutch | butachloor |
Record last updated: Monday 17 October 2016
Contact: aeru@herts.ac.uk