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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:
12.02.2018 - 12.02.2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report Date:
2018

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Version / remarks:
1981
Deviations:
no
Qualifier:
according to
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
2009
Deviations:
no
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid

Results and discussion

Mass median aerodynamic diameter:
12 µm
Geometric standard deviation:
3
Particle sizeopen allclose all
Key result
Percentile:
D10
Mean:
1.6 µm
St. dev.:
0.01
Key result
Percentile:
D50
Mean:
10.1 µm
St. dev.:
0.05
Key result
Percentile:
D90
Mean:
34 µm
St. dev.:
0.13

Any other information on results incl. tables

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

 Test series 1:

D10:      1.6 µm                                                         Standard deviation: 0.01 µm

D50:      10.2 µm         (Median diameter)                Standard deviation: 0.05 µm

D90:      33.8 µm                                                        Standard deviation: 0.18 µm

Test series 2:

D10:      1.6 µm                                                        Standard deviation: 0.01 µm

D50:      10.1 µm         (Median diameter)                Standard deviation: 0.15 µm

D90:      34.1 µm                                                        Standard deviation: 0.23 µm

Average

D10:      1.6 µm                                                         Standard deviation: 0.01 µm

D50:      10.1 µm         (Median diameter)                Standard deviation: 0.05 µm

D90:      34.0 µm                                                        Standard deviation: 0.13 µm

Applicant's summary and conclusion

Conclusions:
2,4-Dihydroxybenzoic acid has a median particle size of D50 = 36 µm.
Executive summary:

The test item 2,4-Dihydroxybenzoic acid has a median particle size of D50 = 10 µm and a MMAD of 12 µm with a GSD of 3.0, which was determined by laser diffraction measurement according to OECD Test Guideline 110 (1981) and ISO 13320 (2009).