| benazolin (Ref: RD 7693) |
 |
Environmental Fate - Ecotoxicology - Human Health - A to Z Index - Home
SUMMARY
Benazolin is a post emergence herbicide that does not have EU approval for use. It has a moderate aqueous solubility, is semi-volatile with a high potential to leach to groundwater. It is not persistent in soil systems but may possibly be persistent in water. Benazolin has a low mammalian toxicity and is not expected to bioaccumulation. It has a low to moderate toxicity to most aquatic organisms, honeybees and earthworms. GENERAL INFORMATION 
for benazolin
Description: A benzothiazolone herbicide for post-emergence control of annual broad-leaved weeds
Example pests controlled: Bedstraw; Chickweed; Bog stitchwort; Stellaria aquatica; Vetch; Shepherd's purse; Wild mustard; Black bindweed; Cleavers
Example applications: Cereals especially wheat; Soybeans; Oilseed rape
Efficacy & activity: -
Availability status: Unknown
Introduction & key dates: 1964
EC Regulation 1107/2009 (repealing 91/414):
| Status | Not approved |
| Dossier rapporteur/co-rapporteur | - |
| 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: 
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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Chemical structure:
| Isomerism | None |
| Chemical formula | C9H6ClNO3S |
| Canonical SMILES | C1=CC2=C(C(=C1)Cl)N(C(=O)S2)CC(=O)O |
| Isomeric SMILES | No data |
| International Chemical Identifier key (InChIKey) | HYJSGOXICXYZGS-UHFFFAOYSA-N |
| International Chemical Identifier (InChI) | InChI=1S/C11H13NO4/c1-11(2)15-8-6-4-5-7(9(8)16-11)14-10(13)12-3/h4-6H,1-3H3,(H,12,13) |
| Structure diagram/image available? | Yes |
General status:
| Pesticide type | Herbicide | |
| Substance group | Benzothiazolone | |
| Minimum active substance purity | - | |
| Known relevant impurities | - | |
| Substance origin | Synthetic | |
| Mode of action | Selective, systemic growth-regulation action. Inhibits auxin transport. | |
| CAS RN | 3813-05-6 | |
| EC number | 223-297-0 | |
| CIPAC number | 136 | |
| US EPA chemical code | - | |
| PubChem CID | 19662 | |
| Molecular mass (g mol-1) | 243.67 | |
| PIN (Preferred Identification Name) | (4-chloro-2-oxo-1,3-benzothiazol-3(2H)-yl)acetic acid | |
| IUPAC name | 4-chloro-2,3-dihydro-2-oxo-1,3-benzothiazol-3-ylacetic acid | |
| CAS name | 4-chloro-2-oxo-3(2H)-benzothiazoleacetic acid | |
| Other status information | - | |
| Relevant Environmental Water Quality Standards | - | |
| Herbicide Resistance Classification (HRAC) | O | |
| Herbicide Resistance Classification (WSSA) | 4 | |
| Insecticide Resistance Classification (IRAC) | Not applicable | |
| Fungicide Resistance Classification (FRAC) | Not applicable | |
| Examples of recorded resistance | - | |
| Physical state | Colourless crystals | |
| 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 as a pesticide under EC Regulation 1107/2009 | |||
| Formulation and application details | Usually supplied as an aqueous suspension concentrate of the ethyl ester (50%). | |||
ENVIRONMENTAL FATE
for benazolin
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Solubility - In water at 20oC (mg l-1) | 500 | B2 | Moderate | |
| Solubility - In organic solvents at 20oC (mg l-1) | 110000 | L3 - Acetone | - | |
| 34000 | L3 - Ethanol | - | ||
| 23000 | L3 - Ethyl acetate | - | ||
| 580 | L3 - Xylene | - | ||
| Melting point (oC) | 193 | L3 | - | |
| Boiling point (oC) | Decomposes before boiling | V3 | - | |
| Degradation point (oC) | - | - | - | |
| Flashpoint (oC) | Not expected to self ignite; Not highly flammable | V3 | - | |
| Octanol-water partition coefficient at pH 7, 20oC | P | 2.19 X 1001 | Calculated | - |
| Log P | 1.34 | L3 | Low | |
| Bulk density (g ml-1)/Specific gravity | 1.63 | Q2 | - | |
| Dissociation constant (pKa) at 25oC | 3.04 | L3 | - | |
| Note: Weak acid | ||||
| Vapour pressure at 20oC (mPa) | 1.00 X 10-04 | L3 | Low volatility | |
| Henry's law constant at 25oC (Pa m3 mol-1) | 4.87 X 10-08 | L3 | Non-volatile | |
GUS leaching potential index  |
3.23 | Calculated | High leachability | |
| SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate |
Value | 2.90 X 10-01 | 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 |
General biodegradability | - |
| Soil degradation (days) (aerobic) | DT50 (typical) | 21 | L3 | Non-persistent |
| DT50 (lab at 20oC) | - | - | - | |
| DT50 (field) | - | - | - | |
| DT90 (lab at 20oC) | - | - | - | |
| DT90 (field) | - | - | - | |
| DT50 modelling endpoint | - | - | - | |
| Note | Best available data | |||
| 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 | Stable | L3 | - |
| Note | - | |||
| Aqueous hydrolysis DT50 (days) at 20oC and pH 7 | Value | Stable | L3 | - |
| Note | Stable pH 4 to pH 9 | |||
| Water-sediment DT50 (days) | - | - | - | |
| Water phase only DT50 (days) | - | - | - | |
Soil adsorption and mobility:
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Linear | Kd | - | S1 | Mobile |
| Koc | 36 | |||
| Notes and range | Estimated | |||
| 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) | 36 | P4 | Low potential |
| CT50 (days) | Not available | - | ||
| Mammals - Acute oral LD50 (mg kg-1) | > 5000 | L3 Rat | Low | |
| Mammals - Short term dietary NOEL | (mg kg-1) | - | L3 Rat | - |
| (ppm diet) | 650 | - | ||
| Birds - Acute LD50 (mg kg-1) | > 10200 | L3 Coturnix japonica | Low | |
| Birds - Short term dietary (LC50/LD50) | - | - | - | |
| Fish - Acute 96 hour LC50 (mg l-1) | > 27 | L3 Lepomis macrochirus | Moderate | |
| Fish - Chronic 21 day NOEC (mg l-1) | - | - | - | |
| Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) | > 233.4 | L3 Daphnia magna | Low | |
| Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) | - | - | - | |
| 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) | > 16 | L1 Unknown species | Low | |
| Algae - Chronic 96 hour NOEC, growth (mg l-1) | 1 | Q0 Unknown species | Moderate | |
| 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) | > 480 | l3 | Low | |
| Earthworms - Acute 14 day LC50 (mg kg-1) | > 1000 | Q3 | Low | |
| 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 benazolin
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) | > 5000 | L3 Rat | Low | |
| Mammals - Dermal LD50 (mg kg-1 body weight) | > 5000 | L3 Rat | - | |
| Mammals - Inhalation LC50 (mg l-1) | 1.43 | L3 Rat | - | |
| Other Mammal toxicity endpoints | - | - | ||
| ADI - Acceptable Daily Intake (mg kg-1bw day-1) | - | - | - | |
| 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 | - | ||
| Occupational | - | |||
| European MRLs | Click here for the EU MRL pesticide database | |||
| Drinking Water Standards | - | - | - | |
| 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 | 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 | Health: H315, H319 Environment: H412 |
|||
| EC Risk Classification |
Xi - Irritant: R36/38 N - Dangerous for the environment: R52, R53 |
|||
| EC Safety Classification |
S2, S22, S61 | |||
| 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 | benazolin |
| French | benazoline |
| German | Benazolin |
| Danish | benazolin |
| Italian | benazolin |
| Spanish | benazolin |
| Greek | benazolin |
| Slovenian | benazolin |
| Polish | benazolina |
| Swedish | benazolin |
| Hungarian | - |
| Dutch | benazoline |
Record last updated: Wednesday 23 May 2018
Contact: aeru@herts.ac.uk