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Diss Factsheets

Physical & Chemical properties

Particle size distribution (Granulometry)

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
14 -29 June 2005
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study conducted under GLP.
Qualifier:
according to guideline
Guideline:
other: MDHS 14: General methods for sampling and gravimetric determination of respirable and total inhalable dust, 2000, HSE, OMHL.
Principles of method if other than guideline:
Air elutriation.
GLP compliance:
yes (incl. QA statement)
Type of method:
other: air elutriation
Type of distribution:
counted distribution
Percentile:
D50
Remarks on result:
other: Not determined in this experiment.(migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.)
No.:
#1
Size:
<= 15 µm
Distribution:
0.02 %
Remarks on result:
other: aerodynamic equivalent diameter (AED)
No.:
#2
Size:
<= 35 µm
Distribution:
0.05 %
Remarks on result:
other: aerodynamic equivalent diameter (AED)
No.:
#3
Size:
<= 50 µm
Distribution:
0.13 %
Remarks on result:
other: aerodynamic equivalent diameter (AED)
No.:
#4
Size:
<= 75 µm
Distribution:
0.15 %
Remarks on result:
other: aerodynamic equivalent diameter (AED)
No.:
#5
Size:
<= 115 µm
Distribution:
0.23 %
Remarks on result:
other: aerodynamic equivalent diameter (AED)
Conclusions:
The study is considered to be valid and reliable for the sample tested.

Description of key information

0.23% <115 µm, 0.02% <15 µm, aerodynamic, Rattray 1 (2005)

Additional information

Several studies have been performed using air elutriation to determine the inhalable and respirable fractions of the substance. The studies were conducted at different times on different batches. This endpoint is expected to be highly dependent on the specific process conditions. This is supported by the batch-to-batch variability observed in the experimental results. The worst case indicates that, depending on the specific process conditions used, some batches may contain moderate levels of respirable particles, and high levels of inhalable particles. The key study selected represents the current quality of material used, and is considered to be suitable for use in risk assessment, classification and labelling.