TABLE 2.

AgNPs Characterization Data

Measurement	Citrate Buffer	20 nm AgNP	110 nm AgNP
Mass concentration metals (XRF) (mg/m3)	NA	7.2 ± 0.8	5.3 ± 1.0
Mass concentration—gravimetric (mg/m3)	5.0 ± 1.7	13.9 ± 2.3	12.4 ± 2.5
SMPS size (nm) (geometric mean, geometric SD)	76.6 σ 1.8	77.4 σ 1.8	78.2 σ 1.8
SMPS particle number (12.6–593 nm)(number of particles/cm3)	1.8  ×  106  ±  0.2 × 106	2.2 × 106 ± 0.4 × 106	1.3 × 106 ± 0.3 × 106
DLS hydrodynamic size (nm) (Z-average ± dispersity)	NA	27.06 ± 0.15a	111.2 ± 0.2a
		27.24 ± 0.21b	106.6 ± 0.2b

Notes: All values are mean ± standard deviation unless otherwise noted.

^aParticles from sealed container.

^bParticles recovered from nebulizer at end of exposure.