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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:
2020
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Remarks:
The data were obtained using methods highly adapted to the in-house products. Furthermore, the laser diffraction method here applied is recommended in internationally recognized guidelines.
Qualifier:
no guideline followed
Principles of method if other than guideline:
Agglomerate/aggregate sizes of cerium gadolinium oxide were measured by laser diffraction.
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
other: aggregates and agglomerates
Type of distribution:
volumetric distribution
Key result
Percentile:
D10
Mean:
0.95 µm
Remarks on result:
other: before ultrasonic dispersion in a US bath
Key result
Percentile:
D10
Mean:
0.47 µm
Remarks on result:
other: after 2mn of ultrasonic dispersion in a US bath
Key result
Percentile:
D50
Mean:
13.7 µm
Remarks on result:
other: before ultrasonic dispersion in a US bath
Key result
Percentile:
D50
Mean:
4 µm
Remarks on result:
other: after 2mn of ultrasonic dispersion in a US bath
Key result
Percentile:
D90
Mean:
44.1 µm
Remarks on result:
other: before ultrasonic dispersion in a US bath
Key result
Percentile:
D90
Mean:
21.2 µm
Remarks on result:
other: after 2mn of ultrasonic dispersion in a US bath
Conclusions:
Agglomerates/aggregates of cerium gadolinium oxide show the following percentile values: D10, D50 and D90 of 0.95, 13.7 and 44.1 µm, respectively, before ultrasonic dispersion in a US bath and D10, D50 and D90 of 0.47, 4.0 and 21.2 µm, respectively after 2mn of ultrasonic dispersion in a US bath.
Executive summary:

The particle size distribution of cerium gadolinium oxide was investigated in a non-GLP compliant study using an internal method highly adapted to the in-house products. Agglomerate/aggregate sizes were measured by laser diffraction, a method recommended in internationally recognized guidelines. Agglomerates/aggregates of cerium gadolinium oxide show the following percentile values: D10, D50 and D90 of 0.95, 13.7 and 44.1 µm, respectively, before ultrasonic dispersion in a US bath and D10, D50 and D90 of 0.47, 4.0 and 21.2 µm, respectively after 2mn of ultrasonic dispersion in a US bath.

Description of key information

Agglomerates/aggregates of cerium gadolinium oxide show the following percentile values: D10, D50 and D90 of 0.95, 13.7 and 44.1 µm, respectively, before ultrasonic dispersion in a US bath and D10, D50 and D90 of 0.47, 4.0 and 21.2 µm, respectively after 2mn of ultrasonic dispersion in a US bath.

Additional information

An experimental study not performed under GLP compliance, using an internal method highly adapted to the in-house products and recommended in internationally-recognized guidelines (i.e. laser diffraction) was flagged as a key study and assigned a Klimisch score of 2. It reports that agglomerates/aggregates of cerium gadolinium oxide show the following percentile values: D10, D50 and D90 of 0.95, 13.7 and 44.1 µm, respectively, before ultrasonic dispersion in a US bath and D10, D50 and D90 of 0.47, 4.0 and 21.2 µm, respectively after 2mn of ultrasonic dispersion in a US bath.