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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:
2012
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
Deviations:
no
Principles of method if other than guideline:
In consideration of the relevance of granulometry study on toxicological assessment, only the size distributions of the sieved fraction < 100 µm was studied in detail.
Type of method:
determination of fibre length and diameter distributions
Type of distribution:
mass based distribution
Percentile:
D50
Mean:
78.22 µm
Remarks on result:
other: Median diameter corresponds to MMAD (Mass Median Aerodynamic Diameter) of the sieve fraction < 100 µm
No.:
#1
Size:
> 100 µm
Distribution:
99.89 %
Remarks on result:
other: weight percent based on total sample
No.:
#2
Size:
<= 100 µm
Distribution:
0.11 %
Remarks on result:
other: weight percent based on total sample

The sample was first sieved by a 100 µm sieve.

weighted sample: 0,77073 g

weight fraction <100 µm: 0.00114 g

mass fraction < 100 µm: 0.15 %

The mass fraction < 100 µm was 0.15 %, and was investigated by scanning electron microscopy. The median aspect ratio was 1.30 with 1.26 as standard deviation.

The median diameter of the particle size is given for the fraction < 100 µm. The value 78.22 µm was calculated for spherical and the value 77.42 was calculated for cubical particles.

 particle size  Spherical Volume[%]  Cubical Volume[%]
 < 4 µm (respirable)  0.00  0.00
 4-10 μm (thoracic)  0.09  0.12
 10-100 μm (inhalable)  73.96  77.58
 > 100 µm*  25.95  22.30
 Median (diameter μm) 78.22   77.42

* These Particles belong to the sieve fraction < 100 μm. Particles with an aspect ratio >1 (e.g. long and thin particles) may have a greater mean diameter than the sieve fraction of 100 μm.

Accounting based on the total sample weight (sperical volume):

Mass fraction > 100 µm: 99.85%

Sieve fraction > 100 µm: 0.04%

Total (> 100 µm): 99.89%

Sieve fraction 10 -100 µm: 0.11%

Sieve fraction 4 -10 µm: 0%

Sieve fraction <4 µm: 0%

Conclusions:
The MMAD (Mass Median Aerodynamic Diameter < 100μm) has a value of 78.22μm as spherical particles. The mass fraction < 100µm was 0.11 % of the total sample.
Executive summary:

According to OECD guideline 110, the particle size distribution of Hydrochloric acid, reaction products with aniline and nitrobenzene, sulfonated, sodium salts was determined by scanning eletron microscopy method for the sieved fraction (<100 µm, 0.11 % of total sample) and presented on the basis of calculated mass fractions. The median diameter was 78.22 µm with the main fraction of 74 % distribution in the range of 10 - 100 µm; and hence the tested Hydrochloric acid, reaction products with aniline and nitrobenzene, sulfonated, sodium salts with sieved size smaller than 100 µm are mainly dominated by inhalable fraction as defined in EN 481.

Description of key information

The MMAD (Mass Median Aerodynamic Diameter < 100μm) has a value of 78.22μm as spherical particles. The mass fraction < 100µm was 0.11 % of the total sample.

Additional information

According to OECD guideline 110, the particle size distribution of Hydrochloric acid, reaction products with aniline and nitrobenzene, sulfonated, sodium salts was determined by scanning eletron microscopy method for the sieved fraction (<100 µm, 0.11 % of total sample) and presented on the basis of calculated mass fractions. The median diameter was 78.22 µm with the main fraction of 74 % distribution in the range of 10 - 100 µm; and hence the tested substance with sieved size smaller than 100 µm are mainly dominated by inhalable fraction as defined in EN 481.