Table 1.

Compounds Detected (μg per mg Aerosol Condensate)^a

compound nameb	low (μg mg−1)	high (μg mg−1)	average ± SD (μg mg−1)
IPA formaldehyde hemiacetald,h	2820	3780	3360 ± 340
4-methyl-1,3-dioxolanec	121	163	141 ± 17
4-hydroxymethyl-1,3-dioxolanec	84	127	104 ± 18
5-hydroxy-1,3-dioxanec	292	413	373 ± 42
4-hydroxymethyl-2-methyl-1,3-dioxolaned	156	183	168 ± 9
acetaldehyde diisopropyl acetald	336	621	469 ± 99
free chloridef	44	68	57 ± 10
3-chloro-1,2-propandiolc	7.6	11.8	9.5 ± 1.4
1,6-dichloro-1,6-dideoxyfructosed	3.5	5.4	4.3 ± 0.8
unidentified chlorinated compounde,g	1.4	2.0	1.7 ± 0.2
β-levoglucosand	29	34	32 ± 2

^aDetection range of target compounds represented as μg per mg aerosol condensate collected, as determined by GC/MS, GC/FID, or IC (samples 25–30, generated using a 1.2 Ω coil at 20 W comprised of 1:1 molar propylene glycol and glycerol). Free chloride was the only target analyte detected in an unvaped starting material blank (Table 2).

^bStructures are depicted in Figure 5.

^cMultipoint calibration prepared from authentic chemical standards, GC/FID peak area normalized to internal standard peak area and mass concentration calculated.

^dAnalyte mass concentration estimated from GC/MS total ion chromatogram (TIC) peak area normalized to internal standard TIC peak area.

^eMultipoint calibration standard used to establish response factor from 1,3-dichloropropan-2-ol, target ion peak area extracted from GC/MS data, and normalized to internal standard extracted target ion peak area to estimate approximate analyte mass concentration.

^fIC used with multipoint calibration standard prepared from sodium chloride.

^gSpectral match identified 1,3-dichloropropanol with high certainty but retention time did not match that of an authentic chemical standard. Spectra suggest this unidentified compound is at least monochlorinated.

^hSee Supporting Information for details on identification.