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Physical & Chemical properties

Particle size distribution (Granulometry)

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Administrative data

Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Modern study conducted to the appropriate guidelines under GLP.
Cross-reference
Reason / purpose:
reference to same study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
Principles of method if other than guideline:
A dry sieve test according to DIN ISO 4497 will be performed to spearate the biggerparticles (>1 mm) from smaller particles and the particulate matter (<100 µm). The particulate matter will then be tested according to OECD 110 particle size distribution by laser diffraction.
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
The test material was obtained from JSC Aktyubinsk Chromium Compounds Plant. The batch number was 3370. The expiry date on the sample was 2009-09-20.

Results and discussion

Particle size
Percentile:
D50
Remarks on result:
other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.
Particle size distribution at different passagesopen allclose all
No.:
#1
Size:
> 1 mm
Distribution:
99.2 %
No.:
#2
Size:
> 0.1 - < 1 mm
Distribution:
0.8 %
No.:
#3
Size:
< 100 µm
Distribution:
< 0.01 %

Any other information on results incl. tables

The complete sample (657.84 g) was sieved manually using two sieves with a mesh size of 1 mm and 10 µm respectively. The three resulting fractions were qunatified gravimetrically. Due to the small amount of particulate matter, no laser diffraction was performed.

Particle fraction

Weight

Amount in %

Share bigger than 1 mm

652.3 g

99.2%

<1 mm but bigger than 100 µm

5.50 g

0.8 g

Particulate matter (<100 µm)

0.06 g

<0.01%

Total

657.87

100%

Applicant's summary and conclusion

Conclusions:
The particle size distribution was 99.2% particles bigger than 1 mm, 0.8% of particles <1 mm and >100 µm and <0.01% of particulate matter (<100 µm ).
Executive summary:

A dry sieve test was performed using two sieves with a mesh size of 1 mm and 10µm respectively. The particle size distribution was 99.2% particles bigger than 1 mm, 0.8% of particles <1 mm and >100µm and <0.01% of particulate matter (<100µm). Due to the fact that no significant amount of particulate matter cound be detected, no laser diffraction was performed.