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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:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
Deviations:
no
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
Laser scattering/diffraction
Type of particle tested:
agglomerate
Type of distribution:
volumetric distribution
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch number of test material:1012001047 & 10082300298 & 10082300301
- Expiration date of the lot/batch: 08/2012
- Purity test date: 08/2010

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: stable 2 y

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: addition of dispersant see below
Mass median aerodynamic diameter:
ca. 15.87 µm
Geometric standard deviation:
ca. 2
Key result
Percentile:
D95
Mean:
ca. 60 µm
St. dev.:
5
Key result
Percentile:
D90
Mean:
ca. 32 µm
St. dev.:
2
Key result
Percentile:
D75
Mean:
ca. 21 µm
St. dev.:
2
Key result
Percentile:
D50
Mean:
ca. 12 µm
St. dev.:
1
Key result
Percentile:
D25
Mean:
ca. 7 µm
St. dev.:
1
Conclusions:
The mean particle size, number in volume, of DPTU test item, is determined to be 15.87 µm (D(4.3)), with 38.8 % of particles presenting a diameter less than 10µm.
Executive summary:

A study was performed to investigate the particle size distribution (granulometry) on 3 batchs of the test substance DPTU (1,3-diphenyl-2-thiourea). The study was conducted according to ISO 13320- 1 “International standard for Laser Diffraction Measurements – Principles of Laser diffraction” and in accordance with OECD Test Guideline 110. The mean particle size, number in volume, of DPTU test item, is determined to be 15.87 µm (D(4.3)), with 38.8 % of particles presenting a diameter less than 10µm.

Description of key information

The mean particle size, number in volume, of DPTU test item, is determined to be 15.87 µm (D(4.3)), with 38.8 % of particles presenting a diameter less than 10µm. 

Additional information

A study was performed to investigate the particle size distribution (granulometry) on 3 batchs of the test substance DPTU (1,3-diphenyl-2-thiourea). The study was conducted according to ISO 13320- 1 “International standard for Laser Diffraction Measurements – Principles of Laser diffraction” and in accordance with OECD Test Guideline 110. The mean particle size, number in volume, of DPTU test item, is determined to be 15.87 µm (D(4.3)), with 38.8 % of particles presenting a diameter less than 10µm.