Registration Dossier
Registration Dossier
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EC number: 230-303-5 | CAS number: 7023-61-2
Nanomaterial aspect ratio / shape
Administrative data
- Endpoint:
- nanomaterial aspect ratio/shape
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2019
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with national standard methods with acceptable restrictions
Data source
Reference
- Reference Type:
- other: unpublished report
- Title:
- Unnamed
- Year:
- 2 019
- Report date:
- 2019
Materials and methods
- Principles of method if other than guideline:
- Image analysis: manual image analysis according to REACH criteria (NanoDefine ParticleSizer)
Guidelines from NanoDefine are applied:
Method selection according to Gaillard et al., Nanoscale Adv., 2019, 1, 781
TEM image evaluation according to Verleysen et al., Materials 2019, 12, 2274; doi:10.3390/ma12142274 - GLP compliance:
- no
- Type of method:
- transmission electron microscopy
- Details on methods and data evaluation:
- TEM: Intertek
Specimen Support Grids: Cu grids coated with a Formvar film.
Specimen preparation: A few mg of the previously wobbled/shaken pigment powder was dispersed in distillated water in an ultrasonic bath. A droplet of the well dispersed and diluted pigment dispersion was transferred to a TEM-grid (Cu) coated with a polymer support film (Formvar®).
Test material
- Reference substance name:
- Calcium 4-[(5-chloro-4-methyl-2-sulphonatophenyl)azo]-3-hydroxy-2-naphthoate
- EC Number:
- 230-303-5
- EC Name:
- Calcium 4-[(5-chloro-4-methyl-2-sulphonatophenyl)azo]-3-hydroxy-2-naphthoate
- Cas Number:
- 7023-61-2
- Molecular formula:
- C18H13ClN2O6S.Ca
- IUPAC Name:
- calcium 4-[(5-chloro-4-methyl-2-sulfonatophenyl)diazenyl]-3-hydroxy-2-naphthoate
- Test material form:
- solid: nanoform
Constituent 1
- Specific details on test material used for the study:
- Batch Nr.: DMG6708
Data gathering
- Instruments:
- TEM - EM910 from Zeiss, e-beam acceleration voltage: 100 keV
- Calibration:
- no data
- Reproducibility:
- no data
Results and discussion
Shape description
- Key result
- Shape:
- rod
- Remarks on result:
- other: The material is assigned to the “elongated” shape category.
Aspect ratio
- Key result
- x Dimension:
- 2.6
- St. dev.:
- 2.4
- y Dimension:
- 1
- Remarks on result:
- other: median (D50)
Any other information on results incl. tables
The number-based concentration of particles with sizes below 100 nm (smallest feret diameter) is 95%. The median (D50) of the particle size is 51.7 nm.
The test substance is therefore classified as “nano” according to the definition of nanomaterial 2011/696/EU.
Applicant's summary and conclusion
- Conclusions:
- The particles have a median aspect ratio of 2.6:1.
The shape is rod.
The material is assigned to the “elongated” shape category.
The number-based concentration of particles with sizes below 100 nm (smallest feret diameter) is 95%. The median (D50) of the particle size is 51.7 nm.
The test substance is therefore classified as “nano” according to the definition of nanomaterial 2011/696/EU.
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