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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:
1996
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)
Deviations:
no
GLP compliance:
yes
Type of method:
electrical sensing zone (e.g. Coulter) method
Type of particle tested:
primary particle
Type of distribution:
counted distribution
Mass median aerodynamic diameter:
ca. 82 µm
No.:
#1
Size:
<= 2.02 µm
Distribution:
1.12 %
No.:
#2
Size:
<= 10.08 µm
Distribution:
8.55 %
No.:
#3
Size:
<= 201.5 µm
Distribution:
1.65 %
No.:
#4
Size:
>= 2.02 - <= 201.5 µm
Distribution:
97.23 %

The particles were relatively large irregularly shaped crystals as viewed under a microscope. Assuming a normal distribution, spherical particles and unit density, the calculated mass median aerodynamic diameter would be ca. 82 µm and the calculated percentage less than 10 µm aerodynamic diameter would be approximately 8.5 %. In the absence of data on the density of this material, an accurate calculation of the likely respirable fraction cannot be made. However, examination of the data indicates that slightly less than 10% of the particles would be likely to have an aerodynamic diameter of less than 10 µm.

Conclusions:
The calculated mass median aerodynamic diameter MMD is ca. 82 um and the calculated percentage less than 10 um aerodynamic diameter would be approximately 8.5 %.
Executive summary:

The study was performed 1996 as GLP-test following OECD-guideline no. 110. The particles were relatively large irregularly shaped crystals as viewed under a microscope. Assuming a normal distribution, spherical particles and unit density, the calculated mass median aerodynamic diameter would be ca. 82 um and the calculated percentage less than 10 um aerodynamic diameter would be approximately 8.5 %. In the absence of data on the density of this material, an accurate calculation of the likely respirable fraction cannot be made. However, examination of the data indicates that slightly less than 10% of the particles would be likely to have an aerodynamic diameter of less than 10 um. There is therefore limited potential for inhalation of the dust of this material.

Description of key information

The study was performed following OECD-guideline no. 110. The calculated mass median aerodynamic diameter is ca. 82 µm and the calculated percentage less than 10 µm aerodynamic diameter would be approximately 8.5%.

Additional information

Reference: GLP-report