Registration Dossier
Registration Dossier
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EC number: 275-177-2 | CAS number: 71077-34-4
Particle size distribution (Granulometry)
Administrative data
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2012
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: well performed study according to acknowledged standards
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 012
- Report date:
- 2012
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- other: ISO 13320-1
- Qualifier:
- according to guideline
- Guideline:
- other: company SOP
- Principles of method if other than guideline:
- A laser beam is shone into a cloud of dispersed particles. The diffraction pattern is measured by a series of photodetectors at different angles. Large particles scatter the light mainly in the forward direction, small particles at larger angles. This is described by the Mie theory. With a suitable fit algorithm, the particle size distribution is adjusted so that calculated and observed scattering intensities agree. Particles within a size range of 1 to 1000 µm can be detected.
Laser diffraction particle sizing measured using Mastersizer 2000 (Malvern Instruments Ltd.). Within the Mastersizer 2000 system, consistent and controlled measurements are achieved through the clear specification of sample dispersion units and critical operating parameters, which ensures proper quality control according to ISO 13320 -1.
Standard operating procedure for dispersion of dry pigment is applied. Particle flow controlled using variable feed-rate vibrating tray unit (Scirocco) . Dispersion achieved by accelerating particles with a compressed air stream of 4 bar.
Measuring time: 10 s; 2 measurements within an interval of 5s are performed (averaged for result)
Concentration: 0.0006 %Vol
Dual wavelength measurement (He-Ne-Laser and blue solid state light source)
Evaluation using Fraunhofer approximation.
Given standard deviation is based on the general experience with the method and pigments. The estimated values are typical standard deviations for pigments:
D10: 4% of D10 (minimum value 0,05 µm)
D50: 13% of D50 (minimum value 0,1 µm)
D90: 29% of D90 - D50 - GLP compliance:
- no
- Type of distribution:
- volumetric distribution
Test material
- Reference substance name:
- Sodium p-(3-amino-4-methylbenzamido)benzenesulphonate
- EC Number:
- 275-177-2
- EC Name:
- Sodium p-(3-amino-4-methylbenzamido)benzenesulphonate
- Cas Number:
- 71077-34-4
- Molecular formula:
- C14H14N2O4S.Na
- IUPAC Name:
- sodium 4-[(3-amino-4-methylbenzoyl)amino]benzenesulfonate
- Details on test material:
- Purity: 99.5%
Constituent 1
Results and discussion
Particle sizeopen allclose all
- Percentile:
- D50
- Mean:
- 4.9 µm
- Remarks on result:
- other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.
- Percentile:
- D10
- Mean:
- 1.4 µm
- St. dev.:
- 0.06
- Percentile:
- D50
- Mean:
- 4.9 µm
- St. dev.:
- 0.6
- Percentile:
- D90
- Mean:
- 13 µm
- St. dev.:
- 2.3
Applicant's summary and conclusion
- Conclusions:
- The mass median diameter of the substance is 4.9 µm.
- Executive summary:
The particle size distribution of the substance was determined using the apparatus Malvern Mastersizer 2000, unit: Scirocco 2000.
The mass median diameter is 4.9 µm
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