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Physical & Chemical properties

Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
07.01.2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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
Deviations:
no
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Percentile:
D10
Mean:
5.3 µm
Remarks on result:
other: SD not indicated
Key result
Percentile:
D50
Mean:
29.3 µm
Remarks on result:
other: SD not indicated
Percentile:
D90
Mean:
791.8 µm
Remarks on result:
other: SD not indicated

The test item consisted of agglomerates and irregular shaped crystals. Thus, prior to the measurements 100 % of the test item were passed through a 1000 µm mesh sieve.


The median particle size L50 (D (v, 0.5): 50 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were: 


1st test series: L50 = 27.8 µm


2nd test series: L50 = 30.9 μm 


The average of the median particle size L50 was: L50 = 29.3 μm


 


The particle size L10 (D (v, 0.1): 10 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were: 


1st test series: L10 = 5.2 μm 


2nd test series: L10 = 5.3 μm 


The average of the particle size L10 was: L10 = 5.3 μm 


 


The particle size L90 (D (v, 0.9): 90 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were: 


1st test series: L90 = 736.1 μm


2nd test series: L90 = 847.4 μm


The average of the particle size L90 was: L90 = 791.8 μm 


 


The particle size distribution showed a bimodal distribution. The first measurement showed two maxima at approx. 10 µm and 500 µm. The second measurement showed two maxima at approx. 10 µm and 600 µm. Additionally a shoulder was observed at approx. 1 µm in both measurements.

Conclusions:
The median particle size L50 of the test item deduced from the particle size distributions was 29.3 μm.
Executive summary:

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110 by laser diffraction. The median particle size L50 of the test item deduced from the particle size distributions was 29.3 μm.

Description of key information

The median particle size L50 of the test item deduced from the particle size distributions was 29.3 μm.

Additional information

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110 by laser diffraction. The median particle size L50 of the test item deduced from the particle size distributions was 29.3 μm.