| cloquintocet-mexyl (Ref: CGA 185072) |
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GENERAL INFORMATION 
Description: A herbicide safener used to improve cereal crop tolerance to the herbicide clodinafop-propargyl
Availability status: Current
Introduction & key dates: 1990
EC Regulation 1107/2009 (repealing 91/414):
| Status | Not approved |
| Dossier rapporteur/co-rapporteur | Not applicable |
| Date inclusion expires | Not applicable |
| EU Candidate for substitution (CfS) | Not applicable |
| 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 |
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Also used in: Australia
Chemical structure:
| Isomerism | The parent herbicide cloquintocet is achiral but the -mexyl ester is chiral. |
| Chemical formula | C18H22ClNO3 |
| Canonical SMILES | CCCCCC(C)OC(=O)COC1=C2C(=C(C=C1)Cl)C=CC=N2 |
| Isomeric SMILES | No data |
| International Chemical Identifier key (InChIKey) | COYBRKAVBMYYSF-UHFFFAOYSA-N |
| International Chemical Identifier (InChI) | InChI=1S/C18H22ClNO3/c1-3-4-5-7-13(2)23-17(21)12-22-16-10-9-15(19)14-8-6-11-20-18(14)16/h6,8-11,13H,3-5,7,12H2,1-2H3 |
| 2D structure diagram/image available? | Yes |
General status:
| Pesticide type | Other substance | |||
| Other constituent type | Herbicide safener | |||
| Substance group | Unclassified | |||
| Minimum active substance purity | - | |||
| Known relevant impurities | - | |||
| Substance origin | Synthetic | |||
| Mode of action | Accelerates the herbicide detoxification process | |||
| CAS RN | 99607-70-2 | |||
| EC number | - | |||
| CIPAC number | - | |||
| US EPA chemical code | 700099 | |||
| PubChem CID | - | |||
| Molecular mass (g mol-1) | 335.8 | |||
| PIN (Preferred Identification Name) | rac-(2R)-heptan-2-yl [(5-chloroquinolin-8-yl)oxy]acetate | |||
| IUPAC name | (RS)-1-methylhexyl (5-chloroquinolin-8-yloxy)acetate | |||
| CAS name | 1-methylhexyl [(5-chloro-8-quinolinyl)oxy]acetate | |||
| Other status information | - | |||
| Relevant Environmental Water Quality Standards | - | |||
| Herbicide Resistance Classification (HRAC) | Not applicable | |||
| Herbicide Resistance Classification (WSSA) | Not applicable | |||
| 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 |
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| Example products using this active |
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| UK LERAP status | Not applicable | |||
| Formulation and application details | - | |||
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Solubility - In water at 20oC (mg l-1) | 0.59 | B5 | Low | |
| Solubility - In organic solvents at 20oC (mg l-1) | 320000 | C4 - Acetone | - | |
| 9000 | C4 - Hexane | - | ||
| 310000 | C4 - Methanol | - | ||
| 320000 | C4 - Toluene | - | ||
| Melting point (oC) | 69.4 | L3 | - | |
| Boiling point (oC) | - | - | - | |
| Degradation point (oC) | - | - | - | |
| Flashpoint (oC) | - | - | - | |
| Octanol-water partition coefficient at pH 7, 20oC | P | 1.07 X 1005 | Calculated | - |
| Log P | 5.03 | B5 | High | |
| Bulk density (g ml-1)/Specific gravity | 1.05 | L3 | - | |
| Dissociation constant (pKa) at 25oC | 3.75 | L3 | - | |
| Note: Weak base | ||||
| Vapour pressure at 20oC (mPa) | 5.31 X 10-03 | B5 | Low volatility | |
| Henry's law constant at 25oC (Pa m3 mol-1) | 3.02 X 10-03 | L3 | Non-volatile | |
GUS leaching potential index  |
0.00 | Calculated | Low leachability | |
| SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate |
Value | 3.29 X 10-03 | 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 |
General biodegradability | - |
| Soil degradation (days) (aerobic) | DT50 (typical) | 5 | W4 | 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 | 3 | Q3 | Moderately fast |
| Note | - | |||
| Aqueous hydrolysis DT50 (days) at 20oC and pH 7 | Value | 139 | C4 | Persistent |
| Note | Stable acid and neutral media, hydrolysed under alkaline conditions | |||
| Water-sediment DT50 (days) | - | - | - | |
| Water phase only DT50 (days) | - | - | - | |
Soil adsorption and mobility:
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Linear | Kd | - | W3 | Non-mobile |
| Koc | 9856 | |||
| 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) | - | - | - |
| CT50 (days) | - | - | ||
| Mammals - Acute oral LD50 (mg kg-1) | > 2000 | B5 Rat | Low | |
| Mammals - Short term dietary NOEL | (mg kg-1) | 9.7 | B4 Rat | High |
| (ppm diet) | 150 | - | ||
| Birds - Acute LD50 (mg kg-1) | 2000 | B5 Colinus virginianus | Moderate | |
| Birds - Short term dietary (LC50/LD50) | - | - | - | |
| Fish - Acute 96 hour LC50 (mg l-1) | 76 | B5 Oncorhynchus mykiss | Moderate | |
| Fish - Chronic 21 day NOEC (mg l-1) | - | - | - | |
| Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) | 100 | B5 Daphnia magna | Moderate | |
| 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) | 0.53 | B4 Scenedemus subspicatus, 72 hour | 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) | > 100 | B5 | Low | |
| Unknown mode acute 48 hour LD50 (μg bee-1) | - | - | - | |
| Earthworms - Acute 14 day LC50 (mg kg-1) | 1000 | 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 | - | - | - | |
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 | B5 Rat | Low | |
| Mammals - Dermal LD50 (mg kg-1 body weight) | > 2000 | L3 Rat | - | |
| Mammals - Inhalation LC50 (mg l-1) | 0.935 | L3 Rat | - | |
| Other Mammal toxicity endpoints | - | - | ||
| ADI - Acceptable Daily Intake (mg kg-1bw day-1) | 0.04 | UK ACP 1999 | - | |
| 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 | |||
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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 | Health: H302, H304, H373 Environment: H400, H410 |
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| EC Risk Classification |
Xn - Harmful: R43 | |||
| EC Safety Classification |
S36, S37 | |||
| WHO Classification | NL | - | Not listed | |
| US EPA Classification (formulation) | No consensus across products or no products available | - | - | |
| UN Number | - | |||
| Waste disposal & packaging |
- | |||
| Language | Name |
| English | cloquintocet-mexyl |
| French | cloquintocet-mexyl |
| German | Cloquintocet-mexyl |
| Danish | cloquintocet-mexyl |
| Italian | cloquintocet-mexyl |
| Spanish | cloquintocet-mexil |
| Greek | - |
| Slovenian | klokvintocet-meksil |
| Polish | klokwintocet meksylowy |
| Swedish | - |
| Hungarian | - |
| Dutch | - |
Record last updated: Thursday 13 September 2018
Contact: aeru@herts.ac.uk