Table 2.

Median (interquartile range) and limit of detection of metal concentrations ($\mathrm{\mu }\mathrm{g}/\mathrm{kg}$) in e-cigarette samples from the dispenser (no previous contact with the device), the aerosol, and the tank (in contact with the device).

Metal	Dispenser ($n=56$)	Aerosol ($n=56$)	Tank ($n=49$)
Al	10.9 (7.22–20.2)	16.3 (12.2–22.2)	31.2 (17.5–128)
Cd	$<0.1$ ($<0.1$, $<0.1$)	$<0.1$ ($<0.1$, 0.134)	0.126 ($<0.1$, 0.267)
Cr	$<0.5$ ($<0.5–2.26$)	8.38 ($<0.5–43.9$)	55.4 (17.4–217)
Cu	5.14 ($<1.0–16.1$)	15.1 (5.70–51.0)	148 (42.0–543)
Fe	26.9 (9.14–91.3)	21.7 ($<0.5–236$)	382 (127–1,360)
Mn	1.09 ($<1.0–2.74$)	2.42 ($<1.0–9.56$)	31.9 (13.0–93.9)
Ni	2.03 ($<1.0–42.1$)	68.4 (6.19–289)	233 (69.5–675)
Pb	0.476 (0.243–1.05)	14.8 (3.10–37.1)	40.2 (13.6–189)
Sb	$<0.1$ ($<0.1–0.219$)	0.553 ($<0.1–1.93$)	0.563 ($<0.1–2.57$)
Sn	1.33 (0.489–3.55)	5.65 (2.38–19.4)	20.3 (9.10–72.2)
Zn	13.1 (6.74–23.0)	515 (228–809)	426 (152–1,540)

Note: Metals with $>50\%$ detection in at least one sample type. The number next to the symbol < corresponds to the limit of detection for each specific metal. For some samples the median, the 25th percentile and/or the 75th percentile were below the limit of detection. Al, aluminum; Cd, cadmium; Cr, chromium; Cu, copper; Fe, iron; Mn, manganese; Ni, nickel; Pb, lead; Sb, antimony; Sn, tin; Zn zinc.