2,3,4-trihydroxybenzophenone

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2015-07-07 to 2015-07-08

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

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

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Version / remarks:

adopted in 2009

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: CIPAC MT 187: Particle Size Analysis by Laser Diffraction

Deviations:

not specified

GLP compliance:

no

Type of method:

Laser scattering/diffraction

Type of particle tested:

primary particle

Type of distribution:

volumetric distribution

Percentile:

D10

Mean:

3.2 µm

Remarks on result:

other: No standard deviation was provided.

Key result

Percentile:

D50

Mean:

21.8 µm

Remarks on result:

other: No standard deviation was provided.

Percentile:

D90

Mean:

194.6 µm

Remarks on result:

other: No standard deviation was provided.

The particles were introduced to the analyser beam by the dry powder feeder by direct spraying through the measurement area. The powder was loosened by an integrated vibrator. The particles were dispersed and fed to the optical system by pressurized dry air (1.5 bar). After passing the spectrometer the sample was collected in a vacuum cleaner.

After adjusting the laser, measuring the background and adjusting the correct particle concentration (obscuration) the measurement was started. The control software automatically performed three measurements. The average of these three measurements was given as result. Two test series of three measurements each were performed. The measurement time was 8 s.

 

The median particle size L₅₀ (D (v, 0.5): 50 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were: 

1^st test series: L₅₀ = 21.3 μm 

2^nd test series: L₅₀ = 22.3 μm 

The average of the median particle size L₅₀ was: L₅₀ = 21.8 μm 

 

The particle size L10 (D (v, 0.1 ): 10 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were: 

1^st test series: L₁₀ = 3.2 μm 

2^nd test series: L₁₀ = 3.2 μm 

The average of the particle size L₁₀ was: L₁₀ = 3.2 μm 

 

The particle size L₉₀ (D (v, 0.9): 90 % of particle volume or particle mass with lower particle diameter) deduced from these distributions were: 

1^st test series: L₉₀ =  194.3 μm 

2^nd test series: L₉₀ = 194.9 μm 

The average of the particle size L₉₀ was: L₉₀ = 194.6 μm 

 

The particle size distribution showed a polymodal distribution with a shoulder at approximately 1 µm. Two maxima were observed at approximately 8 µm and 100 µm, respectively.

Conclusions:

The median particle size L50 of the test item deduced from the particle size distributions was 21.8 μm.

Executive summary:

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110 by laser diffraction. The median particle size L₅₀ of the test item deduced from the particle size distributions was 21.8 μm. 

Description of key information

The median particle size L₅₀ of the test item deduced from the particle size distributions was 21.8 μm. 

Additional information

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110 by laser diffraction. The median particle size L₅₀ of the test item deduced from the particle size distributions was 21.8 μm.