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Table 1 Concentrations of EC emission parameters by flavors and puffing time

From: Nicotine, aerosol particles, carbonyls and volatile organic compounds in tobacco- and menthol-flavored e-cigarettes

  Menthol flavored EC Tobacco flavored EC
EC1Pa EC2Pb EC1Pa EC2Pb
Exp1 Exp2 Mean ± SD Exp1 Exp2 Mean ± SD Exp1 Exp2 Mean ± SD Exp1 Exp2 Mean ± SD
Nicotine, μg/m3 0.6 0.5 0.55 ± 0.07 1.5 3.3 2.40 ± 1.27 1.1 2.7 1.90 ± 1.13 1.1 7.6 4.35 ± 4.60
Aerosol particles
PM2.5, μg/m3 2.7 1.8 2.25 ± 0.64 24.0 343.8 183.90 ± 226.13 3.7 N.A. 21.9 21.1 21.5 ± 0.57
Nanoparticle, ng/m3 492.7 497.8 495.25 ± 3.61 1,013.4 1,044.6 1,029.0 ± 22.06 1,230.6 1,655.2 1,442.90 ± 300.24 2,443.2 2,442.0 2,442.6 ± 0.85
Nanoparticle, #/cm3 5,430.0 5,631.0 5,530.50 ± 142.13 9,294.0 9,498.0 9,396 ± 144.25 10,940.0 12,688.0 11,814 ± 1,236.02 17,722.0 17,857.0 17,789.5 ± 95.46
PNC, #/cm3 7,256.0 8,481.0 7,868.50 ± 866.21 11,929.0 13,651.0 12,790 ± 1,212.64 15,242.0 16,835.0 16,038.5 ± 1,126.42 24,035.0 22,429.0 23,232.0 ± 1,135.61
Carbonyls
Acetaldehyde, ppb 0.4 <LOD <LOD <LOD <LOD <LOD <LOD <LOD
Acetone, ppb 0.4 <LOD <LOD <LOD <LOD <LOD 1.4 5.3 3.35 ± 2.76
VOCs
Ethanol, ppb 29.9 13.7 21.8 ± 11.46 <LOD <LOD 108.7 35.5 72.1 ± 51.76 17.8 15.7 16.75 ± 1.49
Acetonitrile, ppb <LOD <LOD 0.5 <LOD <LOD <LOD 0.9 <LOD
Isopropyl alcohol, ppb <LOD 81.3 <LOD 26.8 10.5 58.8 34.65 ± 34.15 55.8 49.3 52.55 ± 4.60
Benzene, ppb 2.6 N.D. 0.7 1.2 0.95 ± 0.35 0.5 <LOD <LOD 6.6
Toluene, ppb N.D. N.D. N.D. N.D. N.D. N.D. 1.5 N.D.
  1. N. D not detected, N. A not available, LOD limit of detection, Exp1 first experiment, Exp2 repeat analysis of Exp1
  2. aExperiments using 2 ECs in the smoking machine at a frequency of 1 puff per min
  3. bExperiments using 2 ECs in the smoking machine at a frequency of 2 puffs per min
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