. Author manuscript; available in PMC: 2022 Jun 24.

Published in final edited form as: Chem Res Toxicol. 2021 Oct 5;34(10):2227–2233. doi: 10.1021/acs.chemrestox.1c00285

Table 1.

Method Verification Values of α_fb Measured by h-SPME at ~20 °C in 50:50 PG/GL Solutions (by Weight); Nicotine at 6 mg/mL Plus Varying Levels of Strong Acid (HCl) to Partially Protonate the Nicotine

α_fb as prepared	α_fb by h-SPME (N = 3, mean ± 1s)
0.25 ± 0.01	0.23 ± 0.011
	CV = 4.8%^a
0.50 ± 0.01	0.50 ± 0.009
	CV = 1.8%
0.75 ± 0.01	0.78 ± 0.019
	CV = 2.5%

CV = coefficient of variation = s × 100%/mean.