Diiron titanium pentaoxide

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Deviations:

no

Principles of method if other than guideline:

Laser Diffraction Method

GLP compliance:

no

Type of distribution:

volumetric distribution

Key result

Percentile:

D10

Mean:

9.07 µm

Remarks on result:

other: No St.dev. available

Key result

Percentile:

D50

Mean:

20.39 µm

Remarks on result:

other: No St.dev. available

Key result

Percentile:

D90

Mean:

41.3 µm

Remarks on result:

other: No St.dev. available

Conclusions:

The test item consists of crystalline particles with uneven structures. The D10, D50 and D90 percentile were determined as L10 = 9.07 µm, L50 = 20.39 µm and L90 = 41.3 µm, respectively.

Executive summary:

A study was conducted to determine the particle size distribution of the test item according to ISO 13320. Laser diffraction was used for this purpose. The D10, D50 and D90 percentile were determined as L₁₀= 9.07 µm, L₅₀= 20.39 µm and L₉₀= 41.3 µm, respectively.

Reference 2

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2020-02-18

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 A: Particle Size Distribution (effective hydrodynamic radius)

Deviations:

no

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 distribution:

volumetric distribution

Key result

Percentile:

D10

Mean:

7.07 µm

Remarks on result:

other: No St.dev. available

Key result

Percentile:

D50

Mean:

13.1 µm

Remarks on result:

other: No St.dev. available

Key result

Percentile:

D90

Mean:

22.9 µm

Remarks on result:

other: No St.dev. available

The test item consisted of crystalline particles in various shapes.

The test item was tested as a liquid dispersion in distilled water. Before the measurement two spatula points of the test item were mixed with approx. 2 mL distilled water and homogenised. This homogenised dispersion was fed to the sample unit, which was filled with distilled water.

Subsequently the diluted dispersion was pumped to the optical system. After passing the analyser beam the sample was pumped back into the small volume sample dispersion unit.

After adjusting the laser, measuring the background (distilled water) 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 12 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. test series: L₅₀ = 13.1 µm
2. test series: L₅₀ = 13.1 µm

The average of the median particle size L₅₀ was:

L₅₀ = 13.1 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. test series: L₁₀ = 7.08 µm
2. test series: L₁₀ = 7.06 µm

The average of the particle size L₁₀ was

L₁₀ = 7.07 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. test series: L₉₀ = 22.9 µm
2. test series: L₉₀ = 22.9 µm

The average of the particle size L₉₀ was:

L₉₀ = 22.9 µm

 

The particle size distribution showed a monomodal distribution. The maximum was observed between 10 µm and 20 µm.

Conclusions:

The maximum of the monomodal particle size distribution was observed at approximately between 10 µm and 20 µm. The D10, D50 and D90 percentile were determined as L10 = 7.07 µm, L50 = 13.1 µm and L90 = 22.9 µm, respectively.

Executive summary:

A study was conducted to determine the particle size distribution of the test item according to OECD Test Guideline 110, 1SO13320:2009 and CIPAC MT 187. Laser diffraction was used for this purpose. The test item was tested as a liquid dispersion in distilled water. The particle size distribution was determined in two test series. The maximum of the monomodal particle size distribution was observed at between 10 µm and 20 µm. The D10, D50 and D90 percentile were determined as L₁₀ = 7.07 µm, L₅₀ = 13.1 µm and L₉₀ = 22.9 µm, respectively.

Description of key information

The maximum of the monomodal particle size distribution was observed at approximately between 10 µm and 20 µm. The D10, D50 and D90 percentile were determined as L₁₀ = 7.07 µm, L₅₀ = 13.1 µm and L₉₀ = 22.9 µm, respectively.

Additional information

A study was conducted to determine the particle size distribution of the test item according to OECD Test Guideline 110, 1SO13320:2009 and CIPAC MT 187. Laser diffraction was used for this purpose. The test item was tested as a liquid dispersion in distilled water. The particle size distribution was determined in two test series. The maximum of the monomodal particle size distribution was observed at between 10 µm and 20 µm. The D10, D50 and D90 percentile were determined as L₁₀ = 7.07 µm, L₅₀ = 13.1 µm and L₉₀ = 22.9 µm, respectively.