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Diss Factsheets
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EC number: 204-427-5 | CAS number: 120-80-9
- 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
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: The data was obtained using a standardised internal method specifically developped for the case of flakes. This procedure was highly adapted to catechol. Furthermore, the study report contains a high level of experimental details.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Sieving analysis was performed on flakes. Fine fractions (particles < 100 µm) coming from sieving analysis were characterized by laser diffraction particle size analysis. A fragility test with attrition was then carried out on flakes with internal sieving method. The particle size distribution hence obtained was compared with the results of the sieving analysis realized without attrition of flakes.
- GLP compliance:
- no
- Type of method:
- sieving
- Type of distribution:
- volumetric distribution
- Key result
- Percentile:
- D50
- Mean:
- 113.1 µm
- Remarks on result:
- not measured/tested
- Remarks:
- No data available on the st. dev.
- No.:
- #1
- Size:
- < 100 µm
- Distribution:
- 1.05 %
- No.:
- #1
- Size:
- > 100 - < 200 µm
- Distribution:
- 2.05 %
- No.:
- #1
- Size:
- > 200 - < 500 µm
- Distribution:
- 3.48 %
- No.:
- #1
- Size:
- > 500 - < 1 000 µm
- Distribution:
- 3.09 %
- No.:
- #1
- Size:
- > 1 000 - < 5 000 µm
- Distribution:
- 67.78 %
- No.:
- #1
- Size:
- > 5 000 µm
- Distribution:
- 22.55 %
- Conclusions:
- The majority of catechol flakes (90.3% weight) presented sizes superior to 1000 µm. A very small quantity of flakes (1.05%) were found in the size range below 100 µm. Flakes subjected to attrition mainly kept their original size, and did not generate fine particles with size inferior to 100 µm.
- Executive summary:
A standardised internal method specifically developped for the case of flakes was developped. It was applied to catechol flakes. Firstly, a sieving analysis was performed on flakes. The fine fraction (particles size < 100 µm) hence obtained was characterized using laser diffraction particle size analysis. A fragility test using attrition was also carried out to compared the granulometric results with and without attrition to assess the fragility of catechol flakes.
The first sieving analysis (without attrition) revealed that the majority of the flakes (90.3% weight) presented sizes superior to 1000 µm. A very small quantity (1.05%) were found in the size range below 100 µm. A laser diffraction analysis of this fine fraction gave D10, D50 and D90 equal to 60.5 µm, 113.1 µm and 197 µm, respectively. The fragility test showed that flakes subjected to attrition mainly kept their original size, and did not generate fine particles with size inferior to 100 µm.
Reference
Digital camera pictures & Microscope pictures
Tan to brown flakes of catechol presented a great heterogeneity of sizes and shapes with most large flakes ranging from 0.5 to 3 cm. A lot of breakage parts of flakes were present. The finest particles around bigger flakes looked like boken larger objects.
Sieving Analysis on the passing fraction at 2,7mm
Average results for the five samples are presented below:
- 22.6% of the particles weight presented sizes > 5000 µm.
- A great quantity of flakes (67.8% weight) presented sizes in the range from 1000 and 5000 µm.
- 10% of the particles weight presented sizes < 1000 µm.
- 1.05% of the particles weight presented sizes <100 µm (see here after laser diffraction analysis Sympatec).
Laser diffraction particle size analysis performed on fine fraction (< 100 µm)
Measurements
on the fine fraction (< 100 µm) coming from the sieving analysis gave
the following results:
x10=
60.5 µm
x50= 113.1 µm
x90= 197.0 µm
fines <100µm = 40.0%w/w
Particles < 1,8 µm : 0,5% in volume
Particles < 10 µm : 0,9% in volume
Fragility test:
Results obtained in fragility test with attrition are described below:
- The majority of the flakes (92.2% weight) were kept in their original size (>1000 µm).
- 4.6% of the particles weight were found in the range from 500 to 1000 µm.
- 2.46%of the particles weight were found in the range from 200 to 500 µm.
- 0.74 % of the particles weight were foud in the range from 100 to 200 µm.
- No particles were found in the range < 100 µm.
This implies that catechol flakes are not fragile; keeping their original size after attrition. Furthermore, attrition does not generate fines particles with size < 100 µm.
Description of key information
The majority of the catechol flakes (90.3% weight) presented sizes superior to 1000 µm. A very small quantity (1.05%) were found in the size range below 100 µm. A laser diffraction analysis of this fine fraction gave D10, D50 and D90 equal to 60.5 µm, 113.1 µm and 197 µm, respectively. The fragility test showed that flakes subjected to attrition mainly kept their original size, and did not generate fine particles with size inferior to 100 µm.
Additional information
An experimental study is available. It was performed according to a standardized internal method specifically developed for the case of flakes. As this procedure is highly adapted to catechol, this data was scored reliability 1 according to Klimisch and was selected as a key study.
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