PMC

The effect of heater temperature on formaldehyde formation (reported in nominal p.p.m.) as determined using an infrared camera to measure heater coil temperature and FTIR to measure gas-phase formaldehyde.

Representative chromatograms of aerosol formaldehyde and acetaldehyde detected using the UPLC-MS method in the MarkTen^® Classic e-cigarette (~2.5% nicotine by weight) and their respective internal standards (formaldehyde-d₂ and acetaldehyde-d₃). Chromatograms of selected ion monitoring for m/z (A) 209.1, (B) 211.1, (C) 223.1 and (D) 223.1.

The collection train used to directly collect aerosol samples for the determination of carbonyls by UPLC-MS. The single impinger configuration shown consists of a 44-mm CFP in front of the glass impinger containing a DNPH trapping solution.