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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:
2009-08-11 to 2009-08-21
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods
Qualifier:
according to guideline
Guideline:
other: DIN ISO 4497
Deviations:
no
Principles of method if other than guideline:
The dry sieve test is performed according to DIN ISO 4497 using a 1mm and 100 µm sieve to separate bigger particles (>1 mm) from smaller particles and the particulate matter (<100 ). Laser diffraction of the particulate matter was not performed using the method OECD 110 particle size distribution.
GLP compliance:
yes (incl. QA statement)
Remarks:
signed 2006-01-11
Type of method:
sieving
Type of distribution:
volumetric distribution
Specific details on test material used for the study:
Appearance: orange, small crystals with bigger particles and powder
Remarks on result:
not measured/tested
Percentile:
D50
Remarks on result:
not measured/tested
No.:
#1
Size:
> 1 mm
Distribution:
0.6 %
No.:
#2
Size:
> 0.1 - < 1 mm
Distribution:
94.7 %
No.:
#3
Size:
< 100 µm
Distribution:
5.2 %

The complete sample (1074.45 g) was sieved manually using a 1 mm mesh sieve. Approximately 384 g of the fraction smaller then 1 mm were sieved using a sieve of 100 µm mesh. The resulting fractions were quantified gravimetrically.

Particle fraction

Initial Weight

Weight

Amount in %

Share bigger than 1 mm

1074.45 g

6.52 g

0.6 %

<1 mm but bigger than 100 µm

383.81 g

363.45

94.7 %

Particulate matter (<100 µm)

 

20.11

5.2 %

Total

 

 

100.5 %

A dry sieve test was performed using two sieves with a mesh size of 1 mm and 100 µm respectively. The particle size distribution was 0.6 % particles bigger than 1 mm, 94.7 % of particles <1 mm and >100 µm and 5.2 % of particulate matter (<100 µm).

At the request of the sponsor, laser diffraction was not performed because sodium (VI) dichromate is a known carcinogen and therefore a more detailed investigation of the particulate matter (<100  µm) would not reveal significantly new information relevant for risk assessment.

Conclusions:
The particle size distribution was 0.6 % particles bigger than 1 mm, 94.7 % of particles <1 mm and >100 µm and 5.2 % of particulate matter (<100 µm).

Description of key information

The particle size distribution was 0.6 % particles bigger than 1 mm, 94.7 % of particles <1 mm and >100 µm and 5.2 % of particulate matter (<100 µm).

Additional information