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Particle size distribution (Granulometry)

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Description of key information

The granulometry of a representative sample of zinc bis [12-hydroxyoctadecanoate] is summarized as follows (Reichwald, 2009):
D10 = 0.7 µm
D50 = 8.4 µm
D90 = 38.9 µm
Dustiness (Parr, 2012; Grewe, 2012):
total: 193.85 mg/g
MMAD1 = 6.24 µm, GSD1 = 2.09, p1= 0.35
MMAD2 = 32.73 µm, GSD2 = 1.62, p2= 0.65
Estimation of desposited dust fractions in the human respiratory tract:
Head (ET): 55.6%
Tracheobronchial (TB): 0.7%
Pulmonary (PU): 1.7%

Additional information

The D10, D50 and D90 of the particle size distribution of a representative test material are 0.74 µm, 8.44 µm and 38.9 µm, respectively. The total dustiness (airborne fraction) was determined according to method DIN 55992-1:2006 using a modified Heubach dust meter. Total dustiness is 193.85 mg/g. MMAD 1 of the total dustiness fraction is 6.24 µm (GSD 1: 2.09). MMAD 2 of the total dustiness fraction is 32.73 µm (GSD 2: 1.62).

These were used as distribution parameters for the MPPD model enabling an estimation of deposited dust fractions in the human respiratory tract: These fractions were estimated as follows:

Head (ET): 55.6%

Tracheobronchial (TB): 0.7%

Pulmonary (PU): 1.7%