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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:
from 2020-07-01 to 2020-08-27
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
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution
Percentile:
D10
Mean:
21.8 µm
St. dev.:
1.88
Key result
Percentile:
D50
Mean:
> 73 - < 108 µm
St. dev.:
14.24
Percentile:
D90
Mean:
292.4 µm
St. dev.:
38.36

Three test series of 3 measurements each were performed with the inhomogeneous test item.

Test series 1

 

Diameter (µm)

Standard deviation (µm)

D10

24.4

0.74

D50

108.3

2.26

D90

327.2

7.52

Test series 2

 

Diameter (µm)

Standard deviation (µm)

D10

21.0

0.10

D50

90.3

3.68

D90

311.0

6.80

Test series 3

 

Diameter (µm)

Standard deviation (µm)

D10

20.0

0.36

D50

73.4

2.61

D90

238.9

2.75

Average

 

Diameter (µm)

Standard deviation (µm)

D10

21.8

1.88

D50

90.6

14.24

D90

292.4

38.36

 

Conclusions:
Due to the highly inhomogeneous appearance of the test item, no uniformly median particle sizes could be determined. For the particle size D50 of the test item only a range can be specified: D50 = 73 to 108 µm
Executive summary:

The particle size distribution of the test item was determined by laser diffraction measurement according to ISO 13320 (2009) and OECD Test Guideline 110 (1981). Three test series of 3 measurements each were performed with the test item. Due to the highly inhomogeneous appearance of the test item, no uniformly median particle sizes could be determined. For the particle size D50 of the test item only a range can be specified:
D50 = 73 to 108 µm

Description of key information

Due to the highly inhomogeneous appearance of the test item, no uniformly median particle sizes could be determined. For the particle size D50 of the test item only a range can be specified: D50 = 73 to 108 µm (reference 4.5-1).

Additional information

The particle size distribution of the test item was determined by laser diffraction measurement according to ISO 13320 (2009) and OECD Test Guideline 110 (1981). Three test series of 3 measurements each were performed with the test item. Due to the highly inhomogeneous appearance of the test item, no uniformly median particle sizes could be determined. For the particle size D50 of the test item only a range can be specified: D50 = 73 to 108 µm.