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Diss Factsheets
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EC number: 240-815-0 | CAS number: 16752-77-5
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Phototransformation in air
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
- Qualifier:
- according to guideline
- Guideline:
- other: OECD Photochemical Oxidative Degradation in the Environment
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: U.S. EPA Determination of Rates of Reaction in the gas-Phase in the Troposphere §796.3900
- Deviations:
- no
- GLP compliance:
- no
- Remarks:
- OECD Principles of Good Laboratory Practice were not applicable to the preparation of this report.
- Specific details on test material used for the study:
- - Substance name: Methomyl
- Substance ID: DPX-X1179
- Purity: Not reported - Estimation method (if used):
- The accuracy of the estimation methods used was compared against 600 experimentally determined hydroxyl radical rate constants and is within a factor of 2 of the experimental value. An assumed value is a value of a structure fragment estimated by environmental scientists and not derived from experimental values. Structures were entered into the program by SMILES (Simplified Molecular Input Line Entry System).
Group rate constants (kE12 cm³/molecules-sec) are 0.136 for primary carbon and 0.934 for secondary carbon. Substituent factors for hydrogen abstraction are designated as F(X).
Kprim = 0.136 F(-C-) = 0.136 (1.230) = 0.167
Kprim = 0.136 F(-N-C)(=O) O-) = 0.136 (7.500) = 1.020
Kprim = 0.136 F(-S-) = 0.136 (7.800) = 1.061
H Abstraction TOTAL = 2.248E–12 cm³/molecule-sec
In the troposphere, (OH) represents an average concentration which is a function of variables such as season, time of day, temperature, and location. The average 12-hour daylight hydroxyl radical concentration has been estimated as (OH) = 1.5E6 molecules/cm³. - Reference substance:
- no
- Key result
- DT50:
- 19.307 h
- Test condition:
- The half–life of the test substance for reaction with average daily air concentrations of hydroxyl radicals (12-hr day; 1.5E6 OH radicals per cm³)
- Key result
- Reaction with:
- OH radicals
- Rate constant:
- 0 cm³ molecule-1 s-1
- Transformation products:
- not measured
- Conclusions:
- The half–life of the test substance for reaction with average daily air concentrations of hydroxyl radicals (12-hr day; 1.5E6 OH radicals per cm³) is 19.307 hours. Hydrogen abstraction and reaction with both nitrogen and sulfur were predicted to contribute to the rate of photochemical degradation.
- Executive summary:
The calculation of the second order rate constant and associated half-life for the reaction of test substance in the gas phase in the troposphere, using the method of Atkinson is provided. This calculation is an estimate of the photochemical oxidative degradation (indirect phototransformation) of the test substance. The overall OH rate constant is 6.6481E-12 cm³/molecule-sec. The half–life of the test substance for reaction with average daily air concentrations of hydroxyl radicals (12-hr day; 1.5E6 OH radicals per cm³) is 19.307 hours. Hydrogen abstraction and reaction with both nitrogen and sulfur were predicted to contribute to the rate of photochemical degradation.
Reference
Description of key information
Study Type |
Study Details | Value | Guideline | Reliability |
Phototransformation in Air | OH radicals |
DT50 = 19.307 h |
OECD Photochemical Oxidative Degradation in the Environment U.S. EPA Determination of Rates of Reaction in the gas-Phase in the Troposphere §796.3900 |
2 |
Key value for chemical safety assessment
- Half-life in air:
- 19 h
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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