. Author manuscript; available in PMC: 2016 Aug 17.

Published in final edited form as: Chem Res Toxicol. 2015 Jul 22;28(8):1532–1537. doi: 10.1021/acs.chemrestox.5b00107

Table 3.

pH measurements and percentages of Nic and NicH⁺ in random e-liquid cartridges assessed by the described method and compared to prediction from pH and pKa values

Sample (nicotine label)	pH	% of predicted Nic/NicH⁺	% of measured Nic/NicH⁺
V4L (unflavored)	6.30 ± 0.68	5.3/94.7 ± 6.50	10.7/89.3 ± 12.36
V4L (strawberry)	8.11 ± 0.27	55.1/44.9 ± 14.87	92.2/7.8 ± 3.38
Blu (tobacco)	6.85 ± 0.11	6.5/93.5 ± 1.57	16.0/84.0 ± 3.05
V2 (tobacco)	8.63 ± 0.02	80.1/19.9 ± 0.89	97.6/2.4 ± 0.15
V2 (menthol)	8.74 ± 0.02	84.0/16.0 ± 0.65	90.3/9.7 ± 0.88

Cartridge brand