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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:
25.02.2021 - 01.03.2021
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2021
Report date:
2021

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Version / remarks:
1981
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7520 (Particle Size, Fiber Length, and Diameter Distribution)
Version / remarks:
1996
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
2009
Deviations:
not specified
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution

Test material

Constituent 1
Chemical structure
Reference substance name:
4-chlorobenzoic acid
EC Number:
200-805-9
EC Name:
4-chlorobenzoic acid
Cas Number:
74-11-3
Molecular formula:
C7H5ClO2
IUPAC Name:
4-chlorobenzoic acid
Test material form:
solid: particulate/powder
Details on test material:
white to yellowish crytalline powder

Results and discussion

Mass median aerodynamic diameter:
207 µm
Geometric standard deviation:
8.4
Particle sizeopen allclose all
Key result
Percentile:
D90
Mean:
589.1 µm
St. dev.:
8.64
Key result
Percentile:
D50
Mean:
167.8 µm
St. dev.:
5.4
Key result
Percentile:
D10
Mean:
13.1 µm
St. dev.:
0.32

Any other information on results incl. tables

Two test series of 3 measurements each were performed with the test item.

Test series 1:

D10:       13.4 µm                                              Standard deviation: 0.35 µm

D50:       173.2 µm (Median diameter)             Standard deviation: 5.45 µm

D90:       597.7 µm                                            Standard deviation: 16.19 µm

 

Test series 2:

D10:       12.8 µm                                              Standard deviation: 0.24 µm

D50:       162.4 µm (Median diameter)             Standard deviation: 3.80 µm

D90:       580.4 µm                                            Standard deviation: 8.02 µm

 

Average

D10:       13.1 µm                                              Standard deviation: 0.32 µm

D50:       167.8 µm (Median diameter)             Standard deviation: 5.40 µm

D90:       589.1 µm                                            Standard deviation: 8.64 µm

Applicant's summary and conclusion

Conclusions:
The test material of p-Chlorobenzoic acid has a median particle size of D50 = 168 µm.
Executive summary:

The test item p-Chlorobenzoic acid has a median particle size of D50 = 167,8 µm, which was determined by laser diffraction measurement according to OECD Test Guideline 110 (1981), ISO 13320 (2009) and EPA OCSPP Test Guideline OPPTS 830.7520 (1996) and a MMAD of 207 µm with a GSD of 8.4