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EC number: 262-872-0 | CAS number: 61617-00-3
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2011
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Guideline study with acceptable restrictions.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- microscopic examination
- Type of distribution:
- counted distribution
- Key result
- Percentile:
- D50
- Mean:
- 96.44 µm
- Remarks on result:
- other: Mass median diameter
- Conclusions:
- All particles with a mean diameter less than 100 µm have a mass fraction of 3.73 %. 0.074 % / 0.049 % (spherical/ cubical) particles of this mass fraction have a mean diameter less than 4 µm.
Reference
The sample was first sieved by a 100 µm sieve.
weighted sample: 4.4558 g
weight fraction <100 µm: 0.166 g
mass fraction <100 µm: 3.73 %
The mass fraction <100 µm was 3.73 %, and was investigated by scanning electron microscopy. The median aspect ratio was 1.41 with 0.41 as standard deviation.
The median diameter of the particle size is given for the fraction <100 µm. The value 96.44 µm was calculated for cubical and for spherical particles.
| particle size | Spherical Volume | Cubical Volume |
| < 4 µm | 0.074 % | 0.049 % |
| 4 - 10 µm | 0.42 % | 0.32 % |
| 10 - 100 µm | 64.87 % | 63.41 % |
| > 100 µm | 34.64 % | 36.23 % |
| Median (diameter) | 96.44 µm | 96.44 µm |
Description of key information
In a particle size study of ZMB2, all particles with a mean diameter less than 100 µm have a mass fraction of 3.73 %.
Additional information
In an OECD guideline 110, the particle size distribution of ZMB2 was determined by scanning electron microscopy method for the sieved fraction (<100 µm, 3.73 % of total sample) and presented on the basis of calculated mass fractions. The median diameter was 96.44 µm with the main fraction of 64 % distributing in the range of 10 to 100 µm; and hence the particle size of ZMB2 is considered inhalable/respirable fraction as defined in EU 481 (Currenta, 2011).
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