Registration Dossier
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EC number: 601-478-9 | CAS number: 117428-22-5
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
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- Boiling point
- Density
- Particle size distribution (Granulometry)
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- Stability: thermal, sunlight, metals
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- 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
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- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
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- Toxicokinetics, metabolism and distribution
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- 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: U.S. EPA Determination of Rates of Reaction in the GAS - Phase in the Troposphere 796.3900 (1992)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline draft (Photochemical Oxidative Degradation in the Atmosphere)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: Commission Directive 94/37/EC of 22 July 1994, Official Journal of the European Communities, Annex I, Point 2.10.
- Deviations:
- no
- GLP compliance:
- no
- Estimation method (if used):
- PHOTOCHEMICAL REACTION WITH OH RADICALS
- The relationship between the bimolecular rate constant for –OH radical addition to the aromatic rings and the sum of the electrophillic substituent constants of the aromatic rings is (Σσ+) employed.
- Concentration of OH radicals: [OH] = 1.5 x 10e6 molecules/cm³
- Temperature for which rate constant was calculated: 25°C
- Computer program: AOP v1.92
Hydrogen Abstraction: Group rate constants (k x 10e12 cm³ molecules/sec) are 0.136 for primary carbon, 0.934 for secondary carbon, and 1.94 for tertiary carbons. Substituent factors for hydrogen abstraction are designated as F(X). - Key result
- DT50:
- 0.208 d
- Test condition:
- 12-hr day; 1.5E6 OH/cm3
- Remarks on result:
- other: For the test substance
- Key result
- DT50:
- 7.391 d
- Test condition:
- 12-hr day; 1.5E6 OH/cm3
- Remarks on result:
- other: For the test substance metabolite
- Key result
- Reaction with:
- OH radicals
- Rate constant:
- 0 cm³ molecule-1 s-1
- Remarks on result:
- other: For the test substance
- Key result
- Reaction with:
- ozone
- Rate constant:
- 0 cm³ molecule-1 s-1
- Remarks on result:
- other: For the test substance
- Key result
- Reaction with:
- OH radicals
- Rate constant:
- 0 cm³ molecule-1 s-1
- Remarks on result:
- other: For the test substance metabolite
- Transformation products:
- no
- Validity criteria fulfilled:
- yes
- Conclusions:
- Test substance:
Overall OH rate constant: 51.4567E-12 cm³/molecule/sec
Half-life (12-hr day): 0.208 Days (1.5E6 OH/cm³) or 2.494 Hrs
Overall ozone rate constant: 10.500000E-17 cm³/molecule/sec
Half-life (Ozone reaction): 0.109 Days (at 7E11 mol/cm³) or 2.619 Hrs
Test substance metabolite:
Overall OH rate constant: 1.4471E-12 cm³/molecule/sec
Half-life (12-hr day): 7.391 Days (1.5E6 OH/cm³) or 88.696 Hrs
No ozone reaction estimation was done - Executive summary:
The calculation of the second-order rate constant and associated half-life for the reaction of the test substance and its metabolite, IN-QDY64, 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 and IN-QDY64. The overall OH rate constant for picoxystrobin is 51.46 x 10e-12 cm3/molecule-sec and the OH rate constant for IN-QDY64 is 1.45 x 10e-12 cm³/molecule-sec. The half–lives (t1/2) of the test substance and IN-QDY64 for reaction with average daily air concentrations of hydroxyl radicals (12-hr day; 1.5 x 10e6 OH radicals per cm3) are 2.49 hours and 88.7 hours respectively. Hydrogen abstraction, reaction with N and –OH and addition to aromatic rings are predicted to contribute to the rate of photochemical degradation.
Reference
Description of key information
Half-life is 0.208 days or 2.494 hours (12 -hour day)
Key value for chemical safety assessment
- Half-life in air:
- 0.208 d
- Degradation rate constant with OH radicals:
- 0 cm³ molecule-1 s-1
Additional information
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