assessment of the Chemical Evolution of E-Cigarette Droplets.

The results demonstrated that the chemical composition of the
e-cigarette droplets undergoes major changes on a time scale of
a few to some 10 s. More than 50% of the total mass of the ecigarette
droplets evaporates within 20 s. Moreover, the pH of the
e-liquid dictates the time evolution of the nicotine concentration
inside the generated e-cigarette droplets. When an e-liquid with
acidic pH is used, nicotine remains in the generated e-cigarette
droplets, while, under basic pH, nicotine completely evaporates
from the droplets within ~20 s.
Such destruction-free in situ measurements of single particles
are opening up new perspectives for further research on
e-cigarette droplets and e-liquid manufacturing. The measured
partitioning of the main e-cigarette compounds between the
droplet and gas phase as a function of time will improve our
understanding of their deposition in the respiratory tracts
and hence of their impact on health.

David G, Parmentier Ea, Taurino I, Signorell R. assessment of the Chemical Evolution of E-Cigarette Droplets. Chimia. 2020;74(9):733. doi:10.2533/chimia.2020.733