Table 6.

ICP analysis of extraction results in the HCl 0.07 M solution. DL: Detection limit.

Element	Method	Blanc	C4		C5		C6
		µg/L	µg/L	µg/cm2	µg/L	µg/cm2	µg/L	µg/cm2
Fe	ICP-OES	<20	<20	DL	<20	DL	<20	DL
Co	ICP-OES	<10	<10	DL	<10	DL	<10	DL
Cu	ICP-OES	<20	<20	DL	<20	DL	<20	DL
Ni	ICP-OES	<20	433	2.6	407	2.4	421	2.5
As	ICP-MS	<1	<1	DL	<1	DL	<1	DL
Ba	ICP-MS	<0.2	1.3	0.008	1.2	0.007	6.2	0.036
Cd	ICP-MS	<0.2	<0.2	DL	<0.2	DL	<0.2	DL
Cr	ICP-MS	<1	15.0	0.09	17.0	0.10	14.0	0.08
Hg	ICP-MS	<0.5	<0.5	DL	<0.5	DL	<0.5	DL
Pb	ICP-MS	<0.2	0.4	0.002	0.6	0.004	0.5	0.003
Sb	ICP-MS	<0.2	<0.2	DL	<0.2	DL	<0.2	DL
Se	ICP-MS	<1	<1	DL	<1	DL	<1	DL
Te	ICP-MS	<1	<1	DL	<1	DL	<1	DL