p-benzoquinone

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 guideline

Test guideline 1

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:

OECD Test Guideline 110 (1981)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Deviations:

no

GLP compliance:

no

Type of method:

Laser scattering/diffraction

Type of particle tested:

primary particle

Type of distribution:

volumetric distribution

Test material

Test material information

Constituent 1

Reference substance name:

p-benzoquinone

EC Number:

203-405-2

EC Name:

p-benzoquinone

Cas Number:

106-51-4

Molecular formula:

C6H4O2

IUPAC Name:

1,4-benzoquinone

Test material form:

solid: particulate/powder

Results and discussion

Mass median aerodynamic diameter:

115 µm

Geometric standard deviation:

4.7

Particle size

Particle size 1

Key result

Percentile:

D10

Mean:

15.5 µm

St. dev.:

0.17

Particle size 2

Key result

Percentile:

D50

Mean:

99.6 µm

St. dev.:

1.38

Particle size 3

Key result

Percentile:

D90

Mean:

573.1 µm

St. dev.:

5.54

Any other information on results incl. tables

Particle Size Distribution

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

Figure1 and Figure2 show the results of both test series. The test item shows a bimodal particle size distribution with two peaks at approx. 40 – 80 µm and 450 µm.

 

Test series 1 (Figure1):

D₁₀:      15.7 µm                                                       Standard deviation: 0.14 µm

D₅₀:      101.0 µm       (Median diameter)                 Standard deviation: 3.65 µm

D₉₀:      578.7 µm                                                      Standard deviation: 9.16 µm

Test series 2 (Figure2):

D₁₀:      15.4 µm                                                      Standard deviation: 0.77 µm

D₅₀:      98.2 µm         (Median diameter)                 Standard deviation: 8.87 µm

D₉₀:      567.6 µm                                                      Standard deviation: 4.59 µm

Average

D₁₀:      15.5 µm                                                        Standard deviation: 0.17 µm

D₅₀:      99.6 µm         (Median diameter)                 Standard deviation: 1.38 µm

D₉₀:      573.1 µm                                                      Standard deviation: 5.54 µm

Applicant's summary and conclusion

Conclusions:

p-Benzoquinone has a median particle size of D50 = 100 µm as determined by the laser scattering method.

Executive summary:

The test item p-Benzoquinone has a median particle size of D₅₀ = 100 µm, which was determined by laser diffraction measurement according to OECD Test Guideline 110 (1981).