Fig. 1.

SIFT-MS MIM time profiles of water vapour, acetone and ethanol concentrations (in ppbv) measured in alternating mouth (M) and nose (N) exhalations of two volunteers, labelled A and B, after ingestion of 15 mL (by A) and 7.5 mL (by B) of ethanol diluted in 250 mL of water. a) raw data showing concentration in single exhalations, b) variation of concentration with time, including acetaldehyde, for these compounds in mouth exhalations (by B), c) the same for the nose exhalations. The exponential decay rates are both indicated as 17 min. Reproduced from [47] with permission from Wiley.