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Physical & Chemical properties

Particle size distribution (Granulometry)

Administrative data

Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Laser diffraction is the well experienced standard procedure for pigments and dyes to determine particle size distribution of the substance as it is manufactured and delivered.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016
Report date:
2016

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: ISO 13320-1
Principles of method if other than guideline:
Laser diffraction particle sizing
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution

Test material

Constituent 1
Chemical structure
Reference substance name:
Tetrasodium [μ-[3-[[2-amino-5-hydroxy-6-[(2-hydroxy-5-nitro-3-sulphophenyl)azo]-7-sulpho-1-naphthyl]azo]-2-hydroxy-5-sulphobenzoato(8-)]]dichromate(4-)
EC Number:
276-538-7
EC Name:
Tetrasodium [μ-[3-[[2-amino-5-hydroxy-6-[(2-hydroxy-5-nitro-3-sulphophenyl)azo]-7-sulpho-1-naphthyl]azo]-2-hydroxy-5-sulphobenzoato(8-)]]dichromate(4-)
Cas Number:
72252-58-5
Molecular formula:
C23H8Cr2N6O16S3.4Na
IUPAC Name:
tetrasodium [μ-[3-[[2-amino-5-hydroxy-6-[(2-hydroxy-5-nitro-3-sulphophenyl)azo]-7-sulpho-1-naphthyl]azo]-2-hydroxy-5-sulphobenzoato(8-)]]dichromate(4-)

Results and discussion

Particle sizeopen allclose all
Percentile:
D10
Mean:
42 µm
St. dev.:
1.7
Key result
Percentile:
D50
Mean:
407.6 µm
St. dev.:
53
Percentile:
D90
Mean:
983.5 µm
St. dev.:
167

Any other information on results incl. tables

Given standard deviation is based on the general experience with the method. The estimated values are typical standard deviations

D10: 4 % of D10 (minimum value 0.05 µm)

D50: 13 % of D50 (minimum value 0.1 µm)

D90: 29 % of D90 - D50

Applicant's summary and conclusion

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