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Table 3 Concentration and size of airborne particles released from ultrasonic humidifier for each type of water

From: Effect of aerosol particles generated by ultrasonic humidifiers on the lung in mouse

Used water Mass concentration (mg/m 3) Number concentration (#/cm 3) Peak of size distribution (nm)
Tap water 0.46 ± 0.03 (5.0 ± 1.1) × 104 183 ± 9
High-silica water 0.58 ± 0.04 (3.6 ± 0.0) × 104 180 ± 3
CaCl2 (400 mg/L Ca) 1.66 ± 0.16 (6.3 ± 0.5) × 104 >410
CaCl2 (200 mg/L Ca) 1.26 ± 0.19 (4.2 ± 0.3) × 104 356 ± 11
CaCl2 (80 mg/L Ca) 0.46 ± 0.11 (5.0 ± 0.1) × 104 283 ± 9
CaCl2 (40 mg/L Ca) 0.12 ± 0.03 (4.5 ± 0.0) × 104 222 ± 4
CaCl2 (10 mg/L Ca) 0.08 ± 0.01 (3.4 ± 0.1) × 104 123 ± 4
CaCl2 (4 mg/L Ca) 0.02 ± 0.01 (2.7 ± 0.3) × 104 108 ± 2
RO water <0.01 (4.4 ± 0.6) × 104 90 ± 2
Ultrapure water <0.01 (0.7 ± 0.0) × 104 Not determined
  1. Data are shown as mean ± SD, calculated from 5 repeats of 2 min analyses.