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Diss Factsheets

Physical & Chemical properties

Particle size distribution (Granulometry)

Administrative data

Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-07-07 to 2010-10-21
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study was conducted in accordance with OECD no. 110 "particle size distribution" and in compliance with the principles of GLP (certificate included).

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: ISO 13317-2
Deviations:
no
GLP compliance:
no
Type of distribution:
volumetric distribution

Test material

Constituent 1
Reference substance name:
Charcoal
EC Number:
240-383-3
EC Name:
Charcoal
Cas Number:
16291-96-6
IUPAC Name:
Carbón vegetal
Details on test material:
Name: Charcoal (Probe 3: C-Fix = 88.7%)
Batch no.: DP 07.2008/1
Appearance: Charcoal typic
CAS no.: 16291-96-6
EINECS-no.: 240-383-3
Purity: C-Fix: 88.7%
Expiry date: Dec. 2030
Storage: Room temperature 20 ± 5 °C, keep away from humidity

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:
> 77.84 - <= 111.92 µm
Distribution:
ca. 0.64 %
No.:
#2
Size:
> 54.11 - <= 77.84 µm
Distribution:
ca. 0.62 %
No.:
#3
Size:
> 37.59 - <= 54.11 µm
Distribution:
ca. 0.58 %
No.:
#4
Size:
> 26.1 - <= 37.59 µm
Distribution:
ca. 0.46 %
No.:
#5
Size:
> 18.11 - <= 26.1 µm
Distribution:
ca. 0.3 %
No.:
#6
Size:
> 12.55 - <= 18.11 µm
Distribution:
ca. 0.12 %
No.:
#7
Size:
> 8.7 - <= 12.55 µm
Distribution:
ca. 0.05 %
No.:
#8
Size:
> 6.02 - <= 8.7 µm
Distribution:
ca. 0.03 %
No.:
#9
Size:
> 2.54 - <= 6.02 µm
Distribution:
ca. 0.02 %
No.:
#10
Size:
<= 2.55 µm
Distribution:
ca. 0 %

Any other information on results incl. tables

Results of Sieving:

Fraction

Mass of test item

Percentage of fraction relative to the

total weight

 

g

%

>1mm

1284.1

94.32

0.1-1mm

11.5

0.84

<0.1mm

9.9

0.72

The determination was performed in triplicate, using water with 0.1 % of sodium dodecyl sulfate as suspending medium.

In all experiments, sedimentation took place already before the first sampling time: in the three main studies, 7.0% (main study 1), 8.4% (main study 2), and 7.1 % (main study 3) of the particles were not retrieved when determining the 100% value. These particles must be considered as larger than the upper Stokes diameter of 117.54 µm.  

For the measurable part of the test item charcoal (Probe 3: C-Fix = 88.7%) (particles<111.92 µm; 0.67 – 0.68% of total test item), the following particle size distribution was found (for comparison, the correlated values for the total amount of the sieved fraction (< 100µm) are also given):

Stokes-diameter

Fn 
Exp. 1

Fn 
Exp. 2

Fn 
Exp. 3

Fn 
Mean

Difference

between

extreme values of Exp. 1 -3

Fn 
Mean

Fn 
Mean

(Xn) in µm

meas. part

meas. part

meas. part

meas. part

 

total sieved

fraction

(< 100 µm)

total test item
(original sample)

111.92

95.21%

93.51%

97.34%

95.36%

3.83%

88.18%

0.64%

77.84

94.68%

88.65%

91.49%

91.61%

6.03%

84.72%

0.62%

54.11

90.96%

84.32%

84.04%

86.44%

6.91%

79.94%

0.58%

37.59

69.68%

73.51%

63.30%

68.83%

10.22%

63.63%

0.46%

26.10

40.96%

48.11%

45.21%

44.76%

7.15%

41.37%

0.30%

18.11

19.68%

13.51%

18.09%

17.09%

6.17%

15.82%

0.12%

12.55

6.38%

5.95%

9.57%

7.30%

3.63%

6.76%

0.05%

8.70

5.85%

3.24%

3.72%

4.27%

2.61%

3.96%

0.03%

6.02

5.32%

1.62%

1.60%

2.85%

3.72%

2.64%

0.02%

2.54

0.53%

0.00%

0.53%

0.35%

0.53%

0.33%

0.00%

meas. part = measurable part = 0.67 – 0.68% of total test item (particles < 112 µm)

[1] Fn= Mass fraction of particles with a size≤the respective stokes diameter

Applicant's summary and conclusion

Conclusions:
The test item charcoal (Probe 3: C-Fix = 73.3%) shows a particle size distribution of 0.53% ≤ 117 µm and less than 0.05% (> 0.03.%) ≤ 10 µm.