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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:
October 08, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Deviations:
no
Qualifier:
according to
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Deviations:
no
Qualifier:
according to
Guideline:
other: CIPAC MT 187: Particle Size Analysis by Laser Diffraction
Deviations:
no
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
agglomerate
Type of distribution:
volumetric distribution
Specific details on test material used for the study:
The sample was tested as received. No further preliminary treatment such as drying or milling was performed.
Key result
Percentile:
D50
Mean:
245 µm
Remarks on result:
other: no SD reported
Percentile:
D10
Mean:
61 µm
Remarks on result:
other: no SD reported
Percentile:
D90
Mean:
658 µm
Remarks on result:
other: no SD reported

The median particle size D50 (D (v, 0.5): 50 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were:

1st test series: D50 = 239.4 µm

2nd test series: D50 = 249.8 µm

The average of the median particle size D50 was: D50 = 245 µm

The particle size D10 (D (v, 0.1): 10% of particle volume or particle mass with lower particle diameter) deduced from these distributions were:

1st test series: D10 = 60.3 µm

2nd test series: D10 = 61.9 µm

The average of the particle size D10 was: D10 = 61 µm

The particle size D90 (D (v, 0.9): 90 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were:

1st test series: D90 = 635.9 µm

2nd test series: D90 = 679.2 µm

The average of the particle size D90 was: D90 = 658 µm

The particle size distribution showed a monomodal distribution. The maximum was observed at approximately 350 µm. Additionally a weak shoulder was observed at approximately 10 µm.

Final results

The median particle size D50 of the test item deduced from the particle size distributions was 245 µm.

The particle size D10 of the test item deduced from the particle size distributions was 61 µm.

The particle size D90 of the test item deduced from the particle size distributions was 658 µm.

Conclusions:
The median particle size D10, D50 and D90 were determined to be 61 µm, 245 µm and 658 µm, respectively. 
Executive summary:

The particle size distribution of the test item is determined by laser diffraction (light scattering) according to OECD TG 110 and ISO13320:2009.The light from a low power Helium-Neon laser is used to form a collimated and monochromatic beam of light.The beam of light is known as the analyser beam and any particles present within this beam will scatter this laser light.The test item was tested as a liquid dispersion in demineralized water (with 1 % detergent). Before the measurement the test item was mixed with demineralized water (with 1 % detergent) and homogenised. This homogenised dispersion was fed to the sample unit, which was filled with demineralized water (with 1 % detergent).Two test series of three measurements each were performed. The median particle size D50 of the test item deduced from the particle size distributions was 245 µm. The particle size D10 of the test item deduced from the particle size distributions was 61 µm. The particle size D90 of the test item deduced from the particle size distributions was 658 µm.

Description of key information

The median particle size D10, D50 and D90 were determined to be 61 µm, 245 µm and 658 µm, respectively. 

Additional information

The particle size distribution of the test item is determined by laser diffraction (light scattering) according to OECD TG 110 and ISO13320:2009.The light from a low power Helium-Neon laser is used to form a collimated and monochromatic beam of light.The beam of light is known as the analyser beam and any particles present within this beam will scatter this laser light.The test item was tested as a liquid dispersion in demineralized water (with 1 % detergent).Before the measurement the test item was mixed with demineralized water (with 1 % detergent) and homogenised. This homogenised dispersion was fed to the sample unit, which was filled with demineralized water (with 1 % detergent).Two test series of three measurements each were performed. The median particle size D50 of the test item deduced from the particle size distributions was 245 µm. The particle size D10 of the test item deduced from the particle size distributions was 61 µm. The particle size D90 of the test item deduced from the particle size distributions was 658 µm (reference 4.5-1).