Table 6.

Median (interquartile range) metal concentrations ($\mathrm{\mu }\mathrm{g}/\mathrm{kg}$) in samples from the dispenser, aerosol, and tank, by coil material.

Sample	Coil Category	$n$	Al	Cr	Cu	Fe	Mn	Ni	Pb	Sn	Zn
Dispenser ($n=56$)	Kanthal	29	10.0 ($<5.0–18.9$)	$<0.5$ ($<0.5–1.71$)	6.63 ($<1.0–20.9$)	33.5 (14.4–79.7)	1.28 ($<1.0–2.50$)	1.99 ($<1.0–67.7$)	0.481 (0.245–0.978)	2.30 (0.705–3.79)	13.7 (8.57–26.9)
	Other/Combination	13	13.4 (12.2–26.3)	$<0.5$ ($<0.5–2.57$)	$<1.0$ ($<1.0–6.09$)	25.3 (7.93–96.4)	1.14 ($<1.0–4.01$)	$<1.0$ ($<1.0–4.37$)	0.319 ($<0.2–1.18$)	0.555 (0.277–2.16)	8.24 (4.68–14.0)
	Unknown	14	9.25 (8.08–15.0)	$<0.5$ ($<0.5–2.15$)	6.30 ($<1.0–21.0$)	13.4 ($<5.0–88.6$)	$<1.0$ ($<1.0–3.64$)	9.34 ($<1.0–41.0$)	0.462 (0.352–0.996)	1.33 (0.427–3.40)	13.1 (12.2–20.7)
	p-Value		0.33	0.97	0.29	0.77	0.97	0.27	0.92	0.24	0.30
Aerosol ($n=56$)	Kanthal	29	16.2 (12.4–20.3)	15.3 (0.520–46.4)	15.2 (8.63–58.4)	38.6 ($<5.0–507$)	3.43 ($<1.0–9.74$)	122 (7.72–268)	20.4 (7.38–34.8)	6.29 (4.01–19.1)	564 (355–723)
	Other/Combination	13	17.2 (11.4–20.8)	3.74 ($<0.5–43.8$)	21.2 (3.15–164)	28.9 ($<5.0–200$)	1.89 ($<1.0–10.8$)	57.5 (6.18–411)	3.86 (2.37–218)	5.63 (2.75–23.3)	422 (125–668)
	Unknown	14	16.1 (12.1–25.8)	$<0.5$ ($<0.5–25.4$)	12.7 (6.60–24.0)	8.60 ($<5.0–125$)	1.35 ($<1.0–4.69$)	36.7 (6.11–148)	6.89 (4.89–18.2)	3.18 (1.97–12.3)	652 (269–848)
	p-Value		0.99	0.30	0.65	0.66	0.45	0.57	0.59	0.35	0.49
Tank ($n=49$)	Kanthal	25	29.6 (17.5–52.8)	60.3 (17.4–217)	107 (42.0–298)	333 (174–1,360)	31.9 (8.27–86.1)	147 (39.7–467)	33.3 (13.2–77.8)	19.4 (10.2–24.7)	279 (126–449)
	Other/Combination	11	27.7 (14.8–157)	21.5 (12.1–469)	61.5 (28.7–494)	251 (108–2,110)	26.6 (11.2–196)	302 (98.0–877)	23.4 (12.7–188)	9.10 (7.20–40.0)	416 (127–1,470)
	Unknown	13	35.1 (19.4–168)	69.5 (28.4–177)	1,410 (80.3–5,150)	707 (102–1,350)	41.1 (14.0–93.9)	397 (158–638)	189 (40.2–355)	63.0 (26.7–104)	1,550 (537–4,080)
	p-Value		0.80	0.72	0.023	0.91	0.82	0.32	0.13	0.071	0.083

Note: The p-values were obtained from Kruskal-Wallis tests. All tests were two-sided. Al, aluminum; Cr, chromium; Cu, copper; Fe, iron; Mn, manganese; Ni, nickel; Pb, lead; Sn, tin; Zn zinc.