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Particle size distribution (Granulometry)

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Description of key information

The particle size of a representative dipotassium disulfite sample was determined to be: 
D50 = 104.3 µm
D10 = 11.0 µm
D90 = 336.7 µm
Dustiness and MMAD (GSD) of airborne material:
Dustiness: 67.63 mg/g, MMAD (GSD): 28.91 µm (1.61)
For more details see discussion and technical dossier.

Additional information

The particle size distribution of the test item was determined by laser diffraction (light scattering) according to OECD guideline 110.

The test item was tested as received and was analysed with the Master-Sizer 2000 (Version 5.12G) of Malvern Instruments with a dry powder feeder; measuring range was 0.02 to 2000 µm.

In addition to the physical particle size, the dustiness, i.e. the tendency of the materials to become airborne, has been determined with a representative sample using the modified Heubach method (in accordance with DIN 55992 -1:2006, Determination of a parameter for the dust formation of pigments and extenders – Part 1: Rotation method). In this modified method - in addition to the dustiness - the mass median aerodynamic diameter of the airborne particles has been determined using cascade impactor data. Further, the Multiple-Path Particle Dosimetry Model (MPPD, v2.0; CIIT, 2006) was used to predict fractional deposition behaviour of these particles in the human respiratory tract.