Table 3.
Experimental conditions for seven tests. The smoke/aerosol mass load on filters (located upstream the FTIR inlet) and gas phase mass concentrations. The mass accumulated on filters contains droplets, solid particles, tar and other possible gas phase compounds. Note: the weights were obtained without further conditioning for the studied experimental conditions—not the dry mass
| Test | 1 | 2e | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|
| Product | IQOS | IQOS | IQOS | 3R4F | 3R4F | 3R4F | 3R4F |
| Temperature [°C] | 20 to 350 | 20 to 350 | 20 | 20 | 20 | 20 | 20 |
| FTIR flow rate [l/min] | 0.85 | 0.85 | 0.84 | 0.83 | 0.79 | 0.84 | 0.84 |
| Carrier gas flow rate [l/min] | 1.00 | 0.99 | 1.00 | 0.99 | 0.99 | 1.00 | 1.00 |
| Hot dilution flow rate [l/min] | 16.1 | 1.62 | 16.5 | 16.2 | 1.64 | 16.5 | 16.5 |
| PDSPa puff volume [ml] | 55.0 | 55.0 | 55.0 | 55.0 | 55.0 | 55.0 | 55.0 |
| Dilution ratio (DR)b | 308.9 | 47.9 | 316.0 | 310.0 | 48.3 | 316.0 | 316.0 |
| Number of cigarettes/IQOS tobacco sticks | 10 | 18e | 17 | 4 | 0.5c | 4 | 8 |
| Puffs per cigarette/IQOS tobacco stick | 12 | 12 | 12 | 10 | 10 | 10 | 10 |
| Weight of collected smoke/aerosol on filter [mg] | 1.5 | 10e | 3 | 3 | 2 | 3 | 6 |
| DR corrected smoke/aerosol mass concentration [mg/m3] | 9090 | 5220 | 11,100 | 56,000 | 48,900 | 56,400 | 56,400 |
| Smoke/aerosol yield per productd [mg/cig] or [mg/stick] | 6.06 | 3.48e | 7.38 | 31.1 | 27.2 | 31.4 | 31.4 |
| Smoke/aerosol yield per puff [mg] | 0.51 | 0.29 | 0.62 | 3.11 | 2.72 | 3.14 | 3.14 |
aPDSP is a short name of a programmable dual syringe pump, which was used for the testing of cigarettes and heated tobaccos. The puff frequency was 2 per minute (puff duration 2 s, one puff per 30 s)
bThe flow of gases/smoke/aerosol through the FTIR filter was already diluted and it corresponded the outlet concentration of the experimental setup. In order to estimate the initial concentrations of gases and aerosols, a “dilution ratio” factor has been established
cDue to the very low dilution flow rate, the aerosol concentration was very high and therefore, the FTIR filter clogged during the test with first cigarette. Based on FTIR online data, it was estimated that only approximately half of the 3R4F cigarette was burnt when the filter clogged
d10 puffs was taken for 3R4F cigarettes and 12 puffs for IQOS tobacco sticks
eDecreased gas/aerosol transport through the filter during the test. Likely, higher aerosol transport in reality