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. 2016 May 6;124(12):1870–1875. doi: 10.1289/EHP234

Table 1.

Characterization of 20- and 110-nm silver nanoparticles (C20 and C110, respectively) in suspension and following aerosolization (adapted from Anderson et al. 2015).

Parameter Method C20 C110
Hydrodynamic diameter before exposure (nm)a Dynamic light scattering (DLS) 27.06 ± 0.15 111.2 ± 0.2
Hydrodynamic diameter after exposure (nm)a Dynamic light scattering 27.24 ± 0.21 106.6 ± 0.2
Geometric mean size [nm (standard deviation)] Size mobility particle scanning 77.4 (1.8) 78.2 (1.8)
Total particle mass concentration (mg/m3) Gravimetric analysis 13.9 ± 2.3 12.4 ± 2.5
Airborne silver ion concentration (mg/m3) X-ray fluorescence 7.2 ± 0.8 5.3 ± 1.0
Airborne particle number based on airborne concentration of silver (number/m3)b Calculated 1.63 × 1014 7.24 × 1011
aHydrodynamic diameter of particles was measured from sealed containers before exposure and from particles recovered from the nebulizer at the end of exposure. Dynamic light scattering was performed using a Zetasizer Nanosizer ZEN 1690. bAirborne particle number = Airborne concentration from X-ray fluorescence (milligrams/cubic meter)/[mass of C20 or C110 (grams) × 1,000].