Table 2 Results of the determination for test items in plastic tracks.

Test items	n	Detection rates (%)	Test results (mean ± SD^a)	Range (Min–Max)	Medians	LOD	Units
Benzene	167	0	<LOD^b	—	—	0.02	g/kg
Toluene	167	0	<LOD	—	—	0.02	g/kg
Xylenes	167	0	<LOD	—	—	0.02	g/kg
TDI	167	0	<LOD	—	—	0.1	g/kg
Pb	167	81	11.52 ± 17.02	<LOD–101	6.00	0.01	mg/kg
Cd	167	43	0.13 ± 0.28	<LOD–2	<LOD	0.01	mg/kg
Cr	167	83	0.88 ± 1.29	<LOD–4	0.50	0.01	mg/kg
Hg	167	0	<LOD	—	—	0.1	mg/kg
Volatile compounds	123	100	5.83 ± 5.83	1–48	4	—	g/kg
PAHs	147	86	1126.13 ± 1598.92	<LOD–6321	455	0.1	mg/kg
SCCPs	147	46	2.94 ± 8.11	<LOD–68.4	<LOD	0.02	g/kg
Phthalates	147	88	3.48 ± 5.08	<LOD–26.7	1.46	0.005	g/kg
MOCA	24	0	<LOD	—	—	0.5	g/kg
Release rate of TVOC	26	58	0.44 ± 0.55	<LOD–1.7	0.065	0.005	mg/(m²·h)
Release rate of benzene	26	0	<LOD	—	—	0.003	mg/(m²·h)
Release rate of formaldehyde	26	4	<LOD	<LOD–0.01^c	—	0.005	mg/(m²·h)

n, Sample size; ^aStandard deviation; ^bLimit of detection; ^cRelease rate of formaldehyde was detected in only one sample. The data less than LOD were handled as a half of the LOD in the analyses.

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