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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 0
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) - Method B: Fibre Length and Diameter Distributions
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7520 (Particle Size, Fiber Length, and Diameter Distribution)
Deviations:
no
Qualifier:
according to
Guideline:
other: Collaborative International Pesticides Analytical Council Handbook, MT 59, Sieve Analysis
Deviations:
no
GLP compliance:
yes
Type of method:
sieving
Type of particle tested:
primary particle
Type of distribution:
mass based distribution
Test material information:
Composition 1
Key result
Remarks on result:
other: Approximately 96% of the test substance had particles residing in the range from 355 to 45 microns
No.:
#1
Size:
>= 250 µm
Distribution:
ca. 38 %
No.:
#2
Size:
<= 250 µm
Distribution:
ca. 60 %
No.:
#3
Size:
<= 20 µm
Distribution:
ca. 0 %
Remarks on result:
other: distribution was negligible at <20 μm

No sieve clogging or static issues were observed at any point during the testing. The mean weight percent recovery for the two analyses was 97.5%. The particle size distribution dramatically dropped off below 45 microns.

 

Particle Size Distribution Recovery Rate for Run 1

Sieve Size (µm)

Beaker Weight (empty; g)

Beaker Weight (w/residue; g)

Residue Weight (g)

Percent Recovered1

1000

104.8607

104.8620

0.0013

0.0

710

113.1891

113.2000

0.0109

0.4

500

109.6950

109.7301

0.0351

1.1

355

116.4672

116.7791

0.3119

10.1

250

111.2868

112.0832

0.7964

25.9

180

118.8086

119.3620

0.5534

18.0

125

116.3299

116.8759

0.5460

17.7

90

104.7321

105.1069

0.3748

12.2

63

116.3155

116.5788

0.2633

8.6

45

108.9586

109.0340

0.0754

2.4

32

110.0988

110.1024

0.0036

0.1

20

113.1525

113.1526

0.0001

0.0

<20

46.5665

46.5667

0.0002

0.0

Initial sample weight (g): 3.0795

Total weight recovered from sieves (g) = 2.9724

Total percent recovered: 96.5%

1 Generated using Microsoft® Excel in full precision mode. Manual calculations may vary slightly.

 

Particle Size Distribution Recovery Rate for Run 2

Sieve Size (µm)

Beaker Weight (empty; g)

Beaker Weight (w/residue; g)

Residue Weight (g)

Percent Recovered1

1000

112.9001

112.9015

0.0014

0.0

710

111.2229

111.2324

0.0095

0.3

500

109.9475

109.9826

0.0351

1.2

355

109.7424

110.0445

0.3021

10.0

250

115.9331

116.7386

0.8055

26.6

180

110.6252

111.1446

0.5194

17.1

125

115.5298

116.0934

0.5636

18.6

90

112.9665

113.3393

0.3728

12.3

63

114.0950

114.3648

0.2698

8.9

45

110.0893

110.1926

0.1033

3.4

32

108.6427

108.6472

0.0045

0.1

20

116.1001

116.1003

0.0002

0.0

<20

46.5665

46.5666

0.0001

0.0

Initial sample weight (g): 3.0338

Total weight recovered from sieves (g) = 2.9873

Total percent recovered: 98.5%

1 Generated using Microsoft® Excel in full precision mode. Manual calculations may vary slightly.

 

Particle Size Distribution Recovery Rate: Range Determination

Sieve Size (µm)

% Recovery Data (Run 1)

% Recovery Data (Run 2)

Range (%)1

1000

0.0

0.0

0.0

710

0.4

0.3

0.1

500

1.1

1.2

0.1

355

10.1

10.0

0.1

250

25.9

26.6

0.7

180

18.0

17.1

0.9

125

17.7

18.6

0.9

90

12.2

12.3

0.1

63

8.6

8.9

0.3

45

2.4

3.4

1.0

32

0.1

0.1

0.0

20

0.0

0.0

0.0

<20

0.0

0.0

0.0

Range = Abs ((% recovery data Sieve 1) – (% recovery data Sieve 2)); calculated for each sieve size

1 Generated using Microsoft® Excel in full precision mode. Manual calculations may vary slightly.

 

Summary of Particle Size Distribution Recovery Rate: Mean Percent Recovery for Each Sieve

Sieve Size (µm)

Mean Percent Recovered

1000

0.0

710

0.3

500

1.1

355

10.0

250

26.2

180

17.5

125

18.2

90

12.2

63

8.7

45

2.9

32

0.1

20

0.0

<20

0.0

Total Mean Percent Recovery = 97.5

1 Generated using Microsoft® Excel in full precision mode. Manual calculations may vary slightly.

Conclusions:
ca. 38% of particulate matter was ≥250 μm
ca. 60% of particulate matter was <250 μm
Negligible (ca. 0%) amount of particulate matter was <20.0 μm
Executive summary:

The particle size distribution of the test substance was determined using dry sieve analysis for powder material according to OECD Guideline 110. Sieve analysis consisted of the quantitative separation of a powder or granular material into fractions with different ranges of particle size by use of an appropriate sieve or sieves. The dry sieve was performed by a process of shaking, tapping, brushing and weighing. The test was performed using a total of twelve test sieves with nominal aperture sizes ranging from 20.0 to 1000 μm (micron). The testing was performed in duplicate using two separate sub-samples. The test material subsample masses used were 3.0795 and 3.0338 grams. No sieve clogging or static issues were observed at any point during the testing. Approximately 96% of the test substance had particles residing in the range from 355 to 45 microns. The particle size distribution dramatically dropped off below 45 microns. The average amount of particulate matter either at or larger than 250 microns in the test substance was approximately 38%. The average amount of particulate matter smaller than 250 microns in the test substance was approximately 60%. The average amount of particulate matter smaller than 20.0 microns in the test substance was negligible. The mean weight percent recovery for the two analyses was 97.5%.

Description of key information

OECD Guideline 110

Additional information

Approximately 96% of the test substance had particles residing in the range from 355 to 45 microns