TABLE III.
Summary of particle size measured by the DiSCmini (DM) and the SMPS reference instrument for tests with monodispersed aerosols.
| Test Aerosol Composition | dDMA | Concentration Range* | DM | SMPS | Size Ratio (rs) | P-value** | |
|---|---|---|---|---|---|---|---|
| Avg. Geo. Mean Dia. (Std. Dev.) nm | Avg. Geo. Mean Dia. (Std. Dev.) nm | Avg. Geo. Std. Dev. | |||||
| NaCl | 30 | L | 29 (3.8) | 31 (0.44) | 1.4 | 0.94 | 0.33 |
| M | 46 (1.6) | 36 (0.51) | 1.6 | 1.28 | <0.01 | ||
| H | - | - | - | - | - | ||
| 100 | L | 105 (1.7) | 107 (0.67) | 1.3 | 0.98 | 0.10 | |
| M | 112 (2.3) | 114 (4.22) | 1.3 | 0.98 | 0.63 | ||
| H | 118 (2.2) | 118 (1.46) | 1.4 | 1.00 | 0.78 | ||
| 300 | L | 256 (4.0) | 199 (17.2) | 2.0 | 1.28 | 0.01 | |
| M | 232 (16.0) | 272 (1.07) | 1.4 | 0.85 | 0.01 | ||
| H | 263 (11.7) | 258 (1.60) | 1.6 | 1.02 | 0.50 | ||
| Metal | 30 | L | 38 (1.8) | 40 (1.67) | 1.9 | 0.95 | 0.28 |
| M | 24 (0.9) | 31 (0.10) | 1.3 | 0.76 | <0.01 | ||
| H | 21 (0.0) | 30 (0.06) | 1.2 | 0.71 | <0.01 | ||
| 100 | L | 79 (1.2) | 73 (2.32) | 1.9 | 1.08 | 0.02 | |
| M | 76 (0.4) | 92 (0.65) | 1.3 | 0.83 | <0.01 | ||
| H | 79 (0.5) | 94 (0.44) | 1.2 | 0.84 | <0.01 | ||
*
Concentration ranges are: low (L, <103 particles/cm3), medium (M, 103–104 particles/cm3), and high (H, >104 particles/cm3)
**
bold indicates p-value <0.05