Field and Laboratory Measurements Related to Occupational and Consumer Exposures - Safety of Nanomaterials along Their Lifecycle - page 285

Koponen et al.
(2013)

Liquid lame
spraying
(LFS)

Fe x O y PNC, PSD The results for the experimental part focused on agglomeration

showed that over time (>3 times 440 s) for low concentrations, that
is, below 10 5 #/cm 3 , the concentration close to the LFS generator
increases, however, the mode of the primary aerosol size distribution
did not shift to a larger mode, which indicates that no homogeneous
coagulation occurred. For higher concentrations, that is, 2. ×
10 6 #/cm 3 , the FMPS data close to the LFS show a shift to a 20 nm
mode, indicating that homogeneous coagulation may have occurred.
Further away are slightly lower concentrations than at 1 m indicating
that scavenging, agglomeration, and diffusion losses could be
decisive factors when determining far-ield concentrations. The
results of the CFD modeling and the agglomeration experiments
conirm the commonly assumed limit for homogeneous coagulation
of 10 6 #/cm³, which is an important inding with respect to exposure
modeling

Koivisto et al.
(2012a)

LFS TiO 2 TEM, EDX PNC, MC, PSD

PNC in the process room was on average 101 × 10 3 #/cm 3

Source: Göhler, D. et al. (2010), Characterization of nanoparticle release from surface coatings by the simulation of a sanding process, Ann Occup Hyg 54: 615-624.
Abbreviations: CVD, chemical vapor deposition; PSD, particle size distribution; PNC, particle number concentration; SA, surface area; M, mass; NAPD, number-averaged
particle diameter.