| benfuresate (Ref: NC 20484) |
 |
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SUMMARY
Benfuresate is a post-emergence herbicide that is not approved for use in the EU. It has a moderate aqueous solubility and is relatively volatile. It is not persistent in soil systems but not normally persistent in water. It has a low mammalian toxicity and a low potential for bioaccumulation. It is relatively non toxic to birds but moderately toxic to honeybees and most aquatic organisms. GENERAL INFORMATION 
for benfuresate
Description: A benzofuranyl alkylsulfonate herbicide used for post-emergence control of grass and broad-leaved weeds
Example pests controlled: Barnyard grass; Goosegrass; Purple nutsedge; Wild oats; Black nightshade
Example applications: Paddy rice; Fruit; beans; Sugarcane; Cotton; Tobacco
Availability status: Unknown
Introduction & key dates: 1980
EC Regulation 1107/2009 (repealing 91/414):
| Status | Not approved |
| Dossier rapporteur/co-rapporteur | - |
| Date inclusion expires | Expired |
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 |
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Also used in: Japan
General status:
| Pesticide type | Herbicide | |||
| Substance group | Benzofuran | |||
| Minimum active substance purity | - | |||
| Known relevant impurities | - | |||
| Substance origin | Synthetic | |||
| Mode of action | Inhibits lipid synthesis | |||
| CAS RN | 68505-69-1 | |||
| EC number | 270-925-4 | |||
| CIPAC number | 8026 | |||
| US EPA chemical code | - | |||
| Chiral molecule | No | |||
| Chemical formula | C12H16O4S | |||
| SMILES | O=S(=O)(Oc2cc1c(OCC1(C)C)cc2)CC | |||
| International Chemical Identifier key (InChIKey) | QGQSRQPXXMTJCM-UHFFFAOYSA-N | |||
| International Chemical Identifier (InChI) | InChI=1S/C12H16O4S/c1-4-17(13,14)16-9-5-6-11-10(7-9)12(2,3)8-15-11/h5-7H,4,8H2,1-3H3 | |||
| Structure diagram/image available? | Yes | |||
| Molecular mass (g mol-1) | 256.3 | |||
| PIN (Preferred Identification Name) | 3,3-dimethyl-2,3-dihydro-1-benzofuran-5-yl ethanesulfonate | |||
| IUPAC name | 2,3-dihydro-3,3-dimethylbenzofuran-5-yl ethanesulfonate | |||
| CAS name | 2,3-dihydro-3,3-dimethyl-5-benzofuranyl ethanesulfonate | |||
| Other status information | - | |||
| Herbicide Resistance Classification (HRAC) | N | |||
| Herbicide Resistance Classification (WSSA) | 8 | |||
| Insecticide Resistance Classification (IRAC) | Not applicable | |||
| Fungicide Resistance Classification (FRAC) | Not applicable | |||
| Examples of recorded resistance | - | |||
| Physical state | Off-white crystals | |||
| Related substances & organisms | - | |||
Formulations:
| Property |
Value | |||
| Example manufacturers & suppliers of products using this active now or historically |
|
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| Example products using this active | - | |||
| UK LERAP status | No UK approval for use or outside scope | |||
| Formulation and application details | - | |||
ENVIRONMENTAL FATE
for benfuresate
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Solubility - In water at 20oC (mg l-1) | 261 | E4 | Moderate | |
| Solubility - In organic solvents at 20oC (mg l-1) | 1220000 | L3 - Dichloromethane | - | |
| 1050000 | L3 - Acetone | - | ||
| 1040000 | L3 - Toluene | - | ||
| 51000 | L3 - Cyclohexane | - | ||
| Melting point (oC) | 30.01 | L3 | - | |
| Boiling point (oC) | 241 | E4 | - | |
| Degradation point (oC) | - | - | - | |
| Flashpoint (oC) | 37.5 | L3 | - | |
| Octanol-water partition coefficient at pH 7, 20oC | P | 2.57 X 1002 | Calculated | - |
| Log P | 2.41 | E4 | Low | |
| Bulk density (g ml-1)/Specific gravity | 0.96 | L3 | - | |
| Dissociation constant (pKa) at 25oC | Not applicable | Q4 | - | |
| Note: No dissociation | ||||
| Vapour pressure at 25oC (mPa) | 1.43 | L3 | Low volatility | |
| Henry's law constant at 25oC (Pa m3 mol-1) | - | - | - | |
| Henry's law constant at 20oC (dimensionless) | 5.77 X 10-07 | Calculated | Moderately volatile | |
GUS leaching potential index  |
2.13 | Calculated | Transition state | |
| SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate |
Value | 7.41 X 10-02 | Calculated | - |
| Note | - | |||
| Potential for particle bound transport index |
- | Calculated | Low | |
| 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) | 18 | L3 | Non-persistent |
| DT50 (lab at 20oC) | 19 | L3 | Non-persistent | |
| DT50 (field) | 18 | L3 | Non-persistent | |
| DT90 (lab at 20oC) | - | - | - | |
| DT90 (field) | - | - | - | |
| Note | Lab studies DT50 range 18-20 days, field studies DT50 range 7-29 days | |||
| Plant matrix DT50 (days) | Value | - | - | - |
| Note | - | |||
| Aqueous photolysis DT50 (days) at pH 7 | Value | 7 | E4 | Moderately fast |
| Note | - | |||
| Aqueous hydrolysis DT50 (days) at 20oC and pH 7 | Value | 31 | L3 | Moderately persistent |
| Note | Not pH sensitive between pH 5 and 9.2 | |||
| Water-sediment DT50 (days) | - | - | - | |
| Water phase only DT50 (days) | - | - | - | |
Soil adsorption and mobility:
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Linear | Kd | - | L3 | Moderately mobile |
| Koc | 214 | |||
| 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) | 22 | Q2 Estimated | Low potential |
| CT50 (days) | Not available | - | ||
| Mammals - Acute oral LD50 (mg kg-1) | > 4000 | E4 Rat | Low | |
| Mammals - Short term dietary NOEL | (mg kg-1) | 3.1 | L3 Rat | High |
| (ppm diet) | 60 | - | ||
| Birds - Acute LD50 (mg kg-1) | > 10000 | L3 Anas platyrhynchos | Low | |
| Birds - Short term dietary (LC50/LD50) | - | - | - | |
| Fish - Acute 96 hour LC50 (mg l-1) | > 12.3 | L3 Oncorhynchus mykiss | Moderate | |
| Fish - Chronic 21 day NOEC (mg l-1) | - | - | - | |
| Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) | > 35.4 | L3 Daphnia magna | Moderate | |
| Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) | 12.6 | L3 Daphnia magna | Low | |
| 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) | - | - | - | |
| Non-target plants | - | - | - | |
| - | - | - | ||
| Algae - Acute 72 hour EC50, growth (mg l-1) | > 3.8 | L1 Unknown species | Moderate | |
| Algae - Chronic 96 hour NOEC, growth (mg l-1) | - | - | - | |
| Honeybees | Contact acute 48 hour LD50 (μg bee-1) | - | - | - |
| 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) | > 734 | L3 | 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 benfuresate
General:
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Threshold of Toxicological Concern (Cramer Class) |
Low (class I) | - | - | |
| Mammals - Acute oral LD50 (mg kg-1) | > 4000 | E4 Rat | Low | |
| Mammals - Dermal LD50 (mg kg-1 body weight) | > 5000 | E4 Rat | - | |
| Mammals - Inhalation LC50 (mg l-1) | 5.34 | E4 Rat, 4 hr | - | |
| Other Mammal toxicity endpoints | - | - | ||
| ADI - Acceptable Daily Intake (mg kg-1bw day-1) | 0.03 | L3 | - | |
| 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 | - | |||
| 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 | |||
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| Respiratory tract irritant | Skin irritant | Skin sensitiser | Eye irritant | Phototoxicant | ||||
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| 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 found
Handling issues:
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| General |
No information available | |||
| CLP classification 2013 | - | |||
| EC Risk Classification |
N - Dangerous for the environment: R52/53 | |||
| EC Safety Classification |
None allocated at this time | |||
| WHO Classification | III | - | Slightly hazardous | |
| US EPA Classification (formulation) | No consensus across products or no products available | - | - | |
| UN Number | - | |||
| Waste disposal & packaging |
- | |||
| Language | Name |
| English | benfuresate |
| French | benfuresate |
| German | Benfuresat |
| Danish | benfuresat |
| Italian | benfuresato |
| Spanish | benfuresato |
| Greek | - |
| Slovenian | benfuresat |
| Polish | benfuresat |
| Swedish | - |
| Hungarian | - |
| Dutch | - |
Record last updated: Monday 23 November 2015
Contact: aeru@herts.ac.uk