Registration Dossier
Registration Dossier
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EC number: 231-494-8 | CAS number: 7585-41-3
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- other: unpublished report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/ma121 - GLP compliance:
- no
- Type of method:
- transmission electron microscopy
- Details on methods and data evaluation:
- Sample Preparation:
Dispersion in ethanol; transfer to carbon-coated TEM-grids.
Test material
- Reference substance name:
- Barium 4-[(5-chloro-4-methyl-2-sulphonatophenyl)azo]-3-hydroxy-2-naphthoate
- EC Number:
- 231-494-8
- EC Name:
- Barium 4-[(5-chloro-4-methyl-2-sulphonatophenyl)azo]-3-hydroxy-2-naphthoate
- Cas Number:
- 7585-41-3
- Molecular formula:
- C18H13ClN2O6S.Ba
- IUPAC Name:
- barium 4-[(5-chloro-4-methyl-2-sulfonatophenyl)diazenyl]-3-hydroxy-2-naphthoate
- Test material form:
- solid: nanoform
- Details on test material:
- Test materials used in this dossier are all considered to fall under the definition of nano-materials according to the European Commission Recommendation 2011/696/EU as the synthesis and manufacturing of this pigment always yields particulate material with a fine particle size distribution.
Constituent 1
Data gathering
- Instruments:
- Thermo-Fisher Talos 200kV
- Calibration:
- every 12 months with Mag*i*Cal sample
- Reproducibility:
- systematic error +/-3%
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:
- 3.5
- St. dev.:
- 2.1
- y Dimension:
- 1
- Remarks on result:
- other: median (D50)
Applicant's summary and conclusion
- Conclusions:
- - The particles have a median aspect ratio of 3,5:1.
- The shape is rod. The material is assigned to the “elongated” shape category.
- The median (D50) of the particle size is 23,9 nm. The test substance is therefore classified as “nano” according to the definition of nanomaterial 2011/696/EU.
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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