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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:
2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
first edition 2009-10-01
Deviations:
no
Principles of method if other than guideline:
A representative sample, dispersed at an adequate concentration in a suitable liquid, is passed through the beam of a monochromatic light source (laser). A multi-element detector measures the light scattered by the particles at various angles and numerical values relating to the scattering pattern are then recorded for subsequent analysis. These numerical scattering values are then transformed, using an appropriate optical model and mathematical procedure (Mie theory), to yield the proportion of total volume to a discrete number of size classes forming a volumetric particle size distribution.
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution
Mass median aerodynamic diameter:
34.5 µm
Percentile:
D10
Mean:
13.3 µm
St. dev.:
0.2
Key result
Percentile:
D50
Mean:
34.5 µm
St. dev.:
0.8
Percentile:
D90
Mean:
61.5 µm
St. dev.:
1.9

Table No. 1: Results of determination of particle size distribution

Determination

Median

(µm)

Diameter on Cumulative 90%

(µm)

Diameter on Cumulative 10%

(µm)

1

32.9

58.2

13.1

2

33.5

60.2

13.0

3

34.9

63.0

13.3

4

34.5

61.5

13.3

5

34.6

62.3

13.4

Average

34.1

61.0

13.2

Standard deviation

0.8

1.9

0.2
Conclusions:
Particle size distribution of test substance, Direct Black 51, is characterized by the following:Determination Median: 34.5 µmDiameter on Cumulative 90%: 61.5 µmDiameter on Cumulative 10%: 13.3 µm.
Executive summary:

The particle size distribution of the test substance, Direct Black 51 was determined. The laser diffraction method was used. The procedures used in the study were in accordance with: Guidance Document on the Determination of Particle Size Distribution, Fibre Length and Diameter Distribution of Chemical Substances, EUR 20268 EN (2002). Standard ISO 13320: 2009 Particle size analysis – Laser diffraction methods, First edition 2009-10-01.

Particle size distribution of test substance, Direct Black 51, is characterized by the following:

Determination Median: 34.5 µm

Diameter on Cumulative 90%: 61.5 µm

Diameter on Cumulative 10%: 13.3 µm.

Description of key information

Particle size distribution of test substance, Direct Black 51, is characterized by the following:

Determination Median: 34.5 µm

Diameter on Cumulative 90%: 61.5 µm

Diameter on Cumulative 10%: 13.3 µm.

Additional information