| tribufos |
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GENERAL INFORMATION 
for tribufos
Description: An organophosphate defoliant plant growth regulator used mainly in cotton crops
Example pests controlled: Defoliation
Example applications: Cotton
Efficacy & activity: -
Availability status: Unknown
Introduction & key dates: 1965
EC Regulation 1107/2009 (repealing 91/414):
| Status | Not approved |
| Dossier rapporteur/co-rapporteur | Not applicable |
| Date inclusion expires | Expired |
| 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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Chemical structure:
| Isomerism | None |
| Chemical formula | C12H27OPS3 |
| Canonical SMILES | CCCCSP(=O)(SCCCC)SCCCC |
| Isomeric SMILES | No data |
| International Chemical Identifier key (InChIKey) | ZOKXUAHZSKEQSS-UHFFFAOYSA-N |
| International Chemical Identifier (InChI) | InChI=1S/C12H27OPS3/c1-4-7-10-15-14(13,16-11-8-5-2)17-12-9-6-3/h4-12H2,1-3H3 |
| Structure diagram/image available? | Yes |
General status:
| Pesticide type | Plant growth regulator, Herbicide | |
| Substance group | Organophosphate | |
| Minimum active substance purity | - | |
| Known relevant impurities | - | |
| Substance origin | Synthetic | |
| Mode of action | Absorbed by leaves and induces early leaf abscission through changes in the levels of plant hormones | |
| CAS RN | 78-48-8 | |
| EC number | 201-120-8 | |
| CIPAC number | None allocated | |
| US EPA chemical code | 074801 | |
| PubChem CID | 5125 | |
| Molecular mass (g mol-1) | 314.5 | |
| PIN (Preferred Identification Name) | S,S,S-tributyl phosphorotrithioate | |
| IUPAC name | S,S,S-tributyl phosphorotrithioate | |
| CAS name | S,S,S-tributyl phosphorotrithioate | |
| Other status information | - | |
| Relevant Environmental Water Quality Standards | - | |
| Herbicide Resistance Classification (HRAC) | Not known | |
| Herbicide Resistance Classification (WSSA) | - | |
| Insecticide Resistance Classification (IRAC) | Not applicable | |
| Fungicide Resistance Classification (FRAC) | Not applicable | |
| Examples of recorded resistance | Spodoptera litura Helicoverpa armigera Pectinophora gossypiella Spodoptera litura Tetranychus urticae |
|
| Physical state | Colourless to pale yellow liquid | |
| 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 | No UK approval for use as a pesticide under EC Regulation 1107/2009 | |||
| Formulation and application details | Usually supplied as an emulsifiable concentrate. | |||
ENVIRONMENTAL FATE
for tribufos
| Property |
Value | Source/Quality Score/Other Information |
Interpretation |
|
| Solubility - In water at 20oC (mg l-1) | 2.3 | L3 | Low | |
| Solubility - In organic solvents at 20oC (mg l-1) | - | - | - | |
| Melting point (oC) | -25 | L3 | - | |
| Boiling point (oC) | - | - | - | |
| Degradation point (oC) | - | - | - | |
| Flashpoint (oC) | - | - | - | |
| Octanol-water partition coefficient at pH 7, 20oC | P | 3.31 X 1005 | Calculated | - |
| Log P | 5.52 | H4 | High | |
| Bulk density (g ml-1)/Specific gravity | 1.06 | L3 | - | |
| Dissociation constant (pKa) at 25oC | - | - | - | |
| Note: | ||||
| Vapour pressure at 20oC (mPa) | 0.35 | L3 | Low volatility | |
| Henry's law constant at 25oC (Pa m3 mol-1) | 2.90 X 10-02 | H4 | Non-volatile | |
GUS leaching potential index  |
0.11 | Calculated | Low leachability | |
| SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate |
Value | 5.72 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) | 32 | L3 | Moderately persistent |
| DT50 (lab at 20oC) | 10 | F3 | Non-persistent | |
| DT50 (field) | - | - | - | |
| DT90 (lab at 20oC) | - | - | - | |
| DT90 (field) | - | - | - | |
| DT50 modelling endpoint | - | - | - | |
| Note | Literature data variable typically 1-20 days but some sources state DT50 as high as 200-750 days. | |||
| Dissipation rate RL50 on plant matrix | Value | 4.6 | R3 | - |
| Note | Cotton leaves, n=1 | |||
| Dissipation rate RL50 on and in plant matrix | 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 | - | H4 | Non-mobile |
| Koc | 7700 | |||
| Notes and range | Other sources: 5000 mL/g (DW4) | |||
| 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) | 3050 | J4 | Threshold for concern |
| CT50 (days) | Not available | - | ||
| Mammals - Acute oral LD50 (mg kg-1) | 234 | L3 Rat | Moderate | |
| Mammals - Short term dietary NOEL | (mg kg-1) | - | L3 Rat | - |
| (ppm diet) | 10 | - | ||
| Birds - Acute LD50 (mg kg-1) | 142 | L3 Colinus virginianus | Moderate | |
| Birds - Short term dietary (LC50/LD50) | - | - | - | |
| Fish - Acute 96 hour LC50 (mg l-1) | 0.72 | L3 Lepomis macrochirus | Moderate | |
| Fish - Chronic 21 day NOEC (mg l-1) | - | - | - | |
| Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) | 0.12 | L3 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) | 0.15 | F3 Pseudokirchneriella subcapitata, 7 day | Moderate | |
| Algae - Chronic 96 hour NOEC, growth (mg l-1) | - | - | - | |
| Honeybees | Contact acute 48 hour LD50 (μg bee-1) | 44.2 | F4 | Moderate |
| 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) | - | - | - | |
| 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 tribufos
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) | 234 | L3 Rat | Moderate | |
| Mammals - Dermal LD50 (mg kg-1 body weight) | 850 | L3 Rat | - | |
| Mammals - Inhalation LC50 (mg l-1) | 2.46 | 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 | List I | - | - | |
| 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 | Liver, intestine and lung toxicant | |||||||
: 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 |
Corrosive | |||
| CLP classification 2013 | None allocated at this time | |||
| EC Risk Classification |
Xn - Harmful: R22, R38 | |||
| EC Safety Classification |
- | |||
| WHO Classification | NL | - | Not listed | |
| US EPA Classification (formulation) | II | - | Warning - Moderately toxic | |
| UN Number | - | |||
| Waste disposal & packaging |
- | |||
| Language | Name |
| English | tribufos |
| French | tribufos |
| German | Tribufos |
| Danish | tribufos |
| Italian | tribufos (s,s,s-tributil-fosforotritioato) |
| Spanish | tribufos |
| Greek | - |
| Slovenian | tribufos |
| Polish | tribufos |
| Swedish | - |
| Hungarian | - |
| Dutch | - |
Record last updated: Wednesday 30 May 2018
Contact: aeru@herts.ac.uk