Compounds associated with humectant fragmentation in PTR-ToF-MS (acetaldehyde, acetone, methanol) had poor correlation with GC measurements, and the PTR-ToF-MS values are systematically 3 orders of magnitude larger than reported by GC. This was the case for vapeakkutrager, Vapeakkutrager blog entry, all individuals except for vapeakkutrager participant 7. It is probably going that this participant’s exhaled volumes had been inconsistent and resulted in uncertainty in corrected direct injection values calculated with eqs S5 and S6.
Direct injection measurements were not collected in WAS canisters for GC analysis on account of oversaturating detector responses. For PG, acetone is 2 orders of magnitude larger within the PTR-ToF-MS (Figure 5a) in comparison with GC measurements (Figure 5c). Values are of the identical order of magnitude within the GLY experiment, confirming that acetone is a thermal decomposition product from both humectants, but it is also a fragmentation product from PG, additional increasing the acetone response in exhaled breath measurements in the PTR-ToF-MS.
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Similar sort of boiling regimes occur in other thermal programs where a heating element, typically a coil, heats a liquid: electric boilers, kettles and nuclear reactors.