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Diss Factsheets

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:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report date:
2018

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Version / remarks:
1981
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
2009
GLP compliance:
not specified
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution

Test material

Constituent 1
Chemical structure
Reference substance name:
Dipotassium dihydrogen 4-[5-[3-carboxylato-5-hydroxy-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]penta-2,4-dienylidene]-4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate
EC Number:
257-479-6
EC Name:
Dipotassium dihydrogen 4-[5-[3-carboxylato-5-hydroxy-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]penta-2,4-dienylidene]-4,5-dihydro-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazole-3-carboxylate
Cas Number:
51858-17-4
Molecular formula:
C25H16N4O12S2.2K
IUPAC Name:
dipotassium dihydrogen 4-{5-[3-carboxylato-5-oxo-1-(4-sulfonatophenyl)-1,5-dihydro-4H-pyrazol-4-ylidene]penta-1,3-dien-1-yl}-5-hydroxy-1-(4-sulfonatophenyl)-1H-pyrazole-3-carboxylate
Test material form:
solid: crystalline

Results and discussion

Particle sizeopen allclose all
Key result
Percentile:
D10
Mean:
1.4 µm
Remarks on result:
other: after separation of oversize part of the sample (> 2000 µm) of 64.1%
Key result
Percentile:
D50
Mean:
5.6 µm
Remarks on result:
other: after separation of oversize part of the sample (> 2000 µm) of 64.1%
Key result
Percentile:
D90
Mean:
348.6 µm
Remarks on result:
other: after separation of oversize part of the sample (> 2000 µm) of 64.1%

Any other information on results incl. tables

The test item contains a coarse fraction with particle sizes > 2000 µm of 64.1 % (w/w) and a fine fraction with particle sizes < 2000 µm of 35.9 % (w/w).

Two test series of three measurements each were performed with the fine fraction of the test item. The results are shown in the below table:

 

Test series 1 [μm]

Test series 2 [μm]

Average [μm]

D10

1.4

1.4

1.4

D50

5.6

5.6

5.6

D90

350.1

347.1

348.6

The 90%, 50% and 10% mean cumulative size distributions were found to be 348.6 μm, 5.6 μm

and 1.4 μm, respectively.

Applicant's summary and conclusion

Conclusions:
The test item contains a coarse fraction with particle sizes >2000 μm of 64.1 % and a fine fraction with particle sizes <2000 μm of 35.9 %.
The fine fraction of test item has a median particle size D50 = 6 μm, which was determined by laser diffraction measurement.