. 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].