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EC number: 231-177-4 | CAS number: 7440-69-9
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
Description of key information
The particle size of bismuth metal powder was determined for two samples with different particle size grades:
-200 mesh:
D10 = 19.161 µm
D50 = 44.468 µm
D90 = 84.387 µm
-100 mesh:
D10 = 24.622 µm
D50 = 62.624 µm
D90 = 126.998 µm
The MMAD for bismuth metal powder of -200 mesh was determined as given below, since this is the particle size grade that was considered as relevant for further physico/chemical and toxicological testing:
MMAD and GSD (nonlinear monomodal): 27.66 µm (1.66 µm)
Additional information
The information for the particle size distributions of two bismuth metal samples was made available by the Sponsor.
Dustiness of bismuth metal powder (-200 mesh) was determined according to DIN 55992-1:2006 (Determination of a parameter for the dust formation of pigments and extenders – Part 1: Rotation method). As a deviation, the Heubach dust meter was modified in a way that a seven stage cascade impactor is connected to the system. This involves an additional air fed of 20 L/min via the coarse dust separator needed to supply the cascade impactor with 40 L/min air current as specified in the manufacturer’s specifications.
The Multiple-Path Particle Dosimetry Model (MPPD, v2.0; CIIT, 2006) (calculation report, Grewe 2010) was used to predict fractional deposition behaviour for workers.
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