Pyrasulfotole

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:

10 April 2017 to 29 May 2017

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:

not specified

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Deviations:

not specified

Qualifier:

according to guideline

Guideline:

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

Deviations:

not specified

GLP compliance:

yes (incl. QA statement)

Remarks:

GLP certifying authority: Hess. Ministerium für Umwelt, Energie, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany

Type of method:

Laser scattering/diffraction

Type of particle tested:

agglomerate

Type of distribution:

volumetric distribution

Mass median aerodynamic diameter:

11.5 µm

Key result

Percentile:

D10

Mean:

1.7 µm

Remarks on result:

other: No standard deviation was reported.

Key result

Percentile:

D50

Mean:

11.5 µm

Remarks on result:

other: No standard deviation was reported.

Key result

Percentile:

D90

Mean:

38.4 µm

Remarks on result:

other: No standard deviation was reported.

Individual Results

The test item consisted of particles of agglomerates of various shapes.

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 are:

 

1st test series:  L50 = 11.38 µm

2nd test series: L50 = 11.70 µm

The average of the median particle size L50 is L50 = 11.5 µm

 

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

1st test series:  L10 = 1.72 µm

2nd test series: L10 = 1.78 µm

The average of the particle size L10 is L10 = 1.7 µm

 

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

1st test series: L90 = 37.55 µm

2nd test series: L90 = 39.30 µm

The average of the particle size L90 is L90 = 38.4 µm

The measurements showed maxima at approximately 15 µm and 250 µm. A shoulder was observed at  

approximately  1 µm.

 

 

Final Results

The test item consisted of particles of agglomerates of various shapes.

The median particle size L50 of the test item deduced from the particle size distributions is 11.5 µm.

The particle size L10 of the test item deduced from the particle size distributions is 1.7 µm.

The particle size L90 of the test item deduced from the particle size distributions is 38.4 µm.

 

 

Description of key information

dry disperion, volumetric distribution:

D10 is 1.7 µm

D50 is 11.5 µm

D90 is 38.4 µm

(OECD 110 and CIPAC MT 187, laser diffraction)