. Author manuscript; available in PMC: 2015 May 28.

Published in final edited form as: Environ Sci Process Impacts. 2014 May 28;16(6):1275–1281. doi: 10.1039/c3em00626c

Table 3.

Linear regression of metal concentration (ng/m³) measured from the active and estimated from the passive samplers near Saginaw Hill

Metal	Type	DF (%)^*	Mean	SD^**	Median	Range	β⁺	p-value
As	Active	93	0.19	0.11	0.18	ND-0.47	1.80	0.04
As	Passive	100	0.28	0.35	0.20	0.01–1.26
Be	Active	43	0.007	0.01	ND	ND-0.05	0.62	0.04
Be	Passive	21	0.009	0.01	ND	ND-0.04
Mn	Active	100	6.0	5.4	5.3	0.03–23.6	3.36	<0.001
Mn	Passive	100	13.8	20.2	7.2	0.16–78.6
Ni	Active	86	1.0	1.7	0.6	ND-7.0	−0.80	0.63
Ni	Passive	71	7.5	9.9	4.9	ND-29.2
Cd	Active	57	0.13	0.32	0.03	ND-1.3	0.04	0.23
Cd	Passive	86	0.05	0.04	0.05	ND-0.12
Pb	Active	93	1.7	2.1	0.9	ND-8.8	−0.07	0.78
Pb	Passive	93	1.8	1.7	1.8	ND-5.6
Al	Active	100	293	330	192	3.8–1273	0.74	0.16
Al	Passive	21	184	614	ND	ND-2312

DF - detection frequency,

^**

SD - standard deviation,

⁺

β - coefficient from linear regression